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- 12 Letter Words Containing NI
12 Letter Words Containing NI
We found 757 words for 12 letter words containing ni.
The everyday ones come first. Tap any word to see what it means and what it scores.
Common 12 letter words containing NI
- ORGANIZATION22
- UNIVERSITIES15
- ORGANISATION13
- SIGNIFICANCE20
- ENTERTAINING13
- ADMINISTERED16
- HUMANITARIAN17
- CONDITIONING16
- MANIPULATION16
- MUNICIPALITY21
- CONVENIENTLY20
- INDEFINITELY19
- UNIDENTIFIED17
- COMMUNICATED21
- INCONVENIENT17
- RECOGNIZABLE26
- MECHANICALLY24
- COLONIZATION23
- MANIPULATING17
- RECEPTIONIST16
- PROTAGONISTS15
- SYNCHRONIZED30
- PHILHARMONIC24
- DEFINITIVELY22
- MANIPULATIVE19
- PENITENTIARY17
- UNIMAGINABLE17
- ANNIHILATION15
- COMMUNICATES20
- ENLIGHTENING17
- UNILATERALLY15
- IMMUNIZATION25
- DISORGANIZED24
- URBANIZATION23
- COMMUNICATOR20
- MISOGYNISTIC20
- CONDOMINIUMS19
- ANTAGONISTIC15
- UNINTERESTED13
- MEANINGFULLY21
- ASTONISHMENT17
- UNDERPINNING16
- STREAMLINING15
- TESTIMONIALS14
- NUTRITIONIST12
- UNRECOGNIZED25
- COMMUNICABLE22
- MAGNIFICENCE22
- TECHNICALITY22
- CARCINOGENIC19
- CONVENIENCES19
- BICENTENNIAL16
- FRATERNITIES15
- PARTITIONING15
- PROVISIONING18
- UNIVERSALITY18
- POSTCOLONIAL16
- ABOLITIONIST14
- COLONISATION14
- INTRACRANIAL14
- URBANISATION14
- MINIMIZATION25
- PYROTECHNICS24
- REORGANIZING23
- EXPANSIONIST21
- SYNCHRONISED21
- UNIONIZATION21
- GEOTECHNICAL20
- HARMONIOUSLY20
- UNIMPRESSIVE19
- DISCIPLINING18
- REMINISCENCE18
- SECTARIANISM16
- UNIVERSALIST15
- SECESSIONIST14
- ISOLATIONIST12
- DEHUMANIZING28
- SCRUTINIZING24
- BIOMECHANICS23
- CANONIZATION23
- REPLENISHING18
- MANIPULATORS16
- OPPORTUNISTS16
- CONSTRAINING15
- CREATIONISTS14
- ISOLATIONISM14
All 12 letter words containing NI 757
- ORGANIZATION22
- UNIVERSITIES15
- ORGANISATION13
- SIGNIFICANCE20
- ENTERTAINING13
- ADMINISTERED16
- HUMANITARIAN17
- CONDITIONING16
- MANIPULATION16
- MUNICIPALITY21
- CONVENIENTLY20
- INDEFINITELY19
- UNIDENTIFIED17
- COMMUNICATED21
- INCONVENIENT17
- RECOGNIZABLE26
- MECHANICALLY24
- COLONIZATION23
- MANIPULATING17
- RECEPTIONIST16
- PROTAGONISTS15
- SYNCHRONIZED30
- PHILHARMONIC24
- DEFINITIVELY22
- MANIPULATIVE19
- PENITENTIARY17
- UNIMAGINABLE17
- ANNIHILATION15
- COMMUNICATES20
- ENLIGHTENING17
- UNILATERALLY15
- IMMUNIZATION25
- DISORGANIZED24
- URBANIZATION23
- COMMUNICATOR20
- MISOGYNISTIC20
- CONDOMINIUMS19
- ANTAGONISTIC15
- UNINTERESTED13
- MEANINGFULLY21
- ASTONISHMENT17
- UNDERPINNING16
- STREAMLINING15
- TESTIMONIALS14
- NUTRITIONIST12
- UNRECOGNIZED25
- COMMUNICABLE22
- MAGNIFICENCE22
- TECHNICALITY22
- CARCINOGENIC19
- CONVENIENCES19
- BICENTENNIAL16
- FRATERNITIES15
- PARTITIONING15
- PROVISIONING18
- UNIVERSALITY18
- POSTCOLONIAL16
- ABOLITIONIST14
- COLONISATION14
- INTRACRANIAL14
- URBANISATION14
- MINIMIZATION25
- PYROTECHNICS24
- REORGANIZING23
- EXPANSIONIST21
- SYNCHRONISED21
- UNIONIZATION21
- GEOTECHNICAL20
- HARMONIOUSLY20
- UNIMPRESSIVE19
- DISCIPLINING18
- REMINISCENCE18
- SECTARIANISM16
- UNIVERSALIST15
- SECESSIONIST14
- ISOLATIONIST12
- DEHUMANIZING28
- SCRUTINIZING24
- BIOMECHANICS23
- CANONIZATION23
- REPLENISHING18
- MANIPULATORS16
- OPPORTUNISTS16
- CONSTRAINING15
- CREATIONISTS14
- ISOLATIONISM14
- FEMINIZATION26
- MINIATURIZED24
- ANTAGONIZING23
- EXPANSIONISM23
- CALISTHENICS19
- UNIRONICALLY17
- UNIVERSALISM17
- ANNIHILATING16
- INTERTWINING16
- REDEFINITION16
- ASCERTAINING15
- RECOGNITIONS15
- NYMPHOMANIAC26
- RECOGNIZANCE26
- CHAUVINISTIC22
- UNIMAGINABLY20
- CRANIOFACIAL19
- MEGALOMANIAC19
- CONGENIALITY18
- REDUCTIONIST15
- COLONIALISTS14
- DEMONIZATION24
- AUTOIMMUNITY19
- UNDIMINISHED19
- CONTRAVENING18
- NIGHTINGALES17
- PARSIMONIOUS16
- PREMONITIONS16
- REVISIONISTS15
- RECOGNIZABLY29
- POLYTECHNICS24
- ROMANIZATION23
- HARMONICALLY22
- INITIALIZING22
- ANTHOCYANINS20
- FORAMINIFERA20
- ANACHRONISMS19
- CEREMONIALLY19
- OMNIPRESENCE18
- PRECOGNITION17
- REDUCTIONISM17
- PREDNISOLONE15
- RELIGIONISTS13
- CANNIBALIZED26
- QUARANTINING22
- ADMONISHMENT20
- CHRISTENINGS18
- CONGENITALLY18
- SARDONICALLY18
- NICOTINAMIDE17
- TRAMPOLINING17
- ABOLITIONISM16
- DEFINITIONAL16
- SUBURBANITES16
- ADMINISTRATE15
- EDUCATIONIST15
- SCRUTINISING15
- PUMPERNICKEL24
- HONEYMOONING21
- PERSONIFYING21
- CUMULONIMBUS20
- DIMINISHMENT20
- MINICOMPUTER20
- PARKINSONISM20
- EXTORTIONIST19
- STEREOPHONIC19
- APPORTIONING17
- NONIMMIGRANT17
- DEFINITENESS16
- OVERTRAINING16
- TRANSOCEANIC16
- EVOLUTIONIST15
- ABORTIONISTS14
- ACETONITRILE14
- UNITARIANISM14
- ILLUSIONISTS12
- SYNCHRONIZER29
- SYNCHRONIZES29
- PRIZEWINNING27
- HUMANIZATION26
- DECOLONIZING25
- FRATERNIZING25
- SAXOPHONISTS24
- KLEPTOMANIAC22
- SANITIZATION21
- COMMUNICANTS20
- PRECOGNITIVE20
- MONOTONICITY19
- PLATONICALLY19
- TECTONICALLY19
- ACCORDIONIST17
- DIMENSIONING16
- HOMOGENIZING28
- COMPANIONWAY24
- HYDROPLANING22
- INDEMNIFYING22
- VOLCANICALLY22
- NONTECHNICAL19
- TOBACCONISTS18
- UNINFLUENCED18
- EVOLUTIONISM17
- NITROMETHANE17
- SEMINIFEROUS17
- MISCELLANIES16
- MINISTRATION14
- NITROSAMINES14
- MASCULINIZED26
- SKELETONIZED26
- HYGIENICALLY24
- ANTICYCLONIC21
- CARTOONISHLY20
- REFASHIONING19
- EPICUREANISM18
- GARNISHMENTS18
- PARKINSONIAN18
- UNIMPORTANCE18
- APPERTAINING17
- INTEROCEANIC16
- NEURASTHENIA15
- INTUITIONISM14
- QUINQUENNIAL30
- QUADRAPHONIC29
- ZWITTERIONIC26
- WESTERNIZING25
- VIBRAPHONIST22
- SALINIZATION21
- ACCOMPANISTS20
- PHILISTINISM19
- ANTIFEMINIST17
- CANNIBALISED17
- LUMINIFEROUS17
- PELARGONIUMS17
- PRESCREENING17
- SUBMINIATURE16
- ANTICOLONIAL14
- UNIONISATION12
- UNIVERSALIZE24
- NITROBENZENE23
- EXTRACRANIAL21
- FERROCYANIDE21
- NIGHTCLOTHES21
- MUTAGENICITY20
- OVERNIGHTING20
- TYRANNICALLY20
- BREADWINNING19
- CHARLATANISM19
- OVERNIGHTERS19
- VENIPUNCTURE19
- COMPANIONATE18
- MONOMANIACAL18
- PROTACTINIUM18
- INHARMONIOUS17
- CRANIOSACRAL16
- SECESSIONISM16
- WOLLASTONITE15
- ANISOTROPIES14
- BOUTONNIERES14
- INTUITIONIST12
- AMPHICTYONIC26
- DEIONIZATION22
- CHALCOGENIDE21
- ECUMENICALLY21
- FERRICYANIDE21
- LATINIZATION21
- PANCYTOPENIA21
- SYNCHRONISES20
- VINIFICATION20
- ANTIFEMINISM19
- DECALCOMANIA19
- HOMOGENISING19
- NICKELODEONS19
- PERNICIOUSLY19
- NEURASTHENIC17
- PRECISIONIST16
- SUBMUNITIONS16
- ANNIHILATORS15
- ANTHRANILATE15
- DETERMINISTS15
- SALVATIONIST15
- POCKETKNIVES27
- CANNIBALIZES25
- BIOTECHNICAL21
- EXCLUSIONIST21
- DENITRIFYING20
- CALYPSONIANS19
- ANTIGENICITY18
- ACCESSIONING17
- FEMININITIES17
- NIGHTDRESSES17
- NIMBOSTRATUS16
- GUILLOTINING14
- MINIATURISTS14
- TRANSURANIUM14
- UNIRRADIATED14
- MICROPHONICS23
- NIGHTWALKERS23
- MUNIFICENTLY22
- POSTFEMINIST19
- REFURNISHING19
- ELECTROGENIC17
- FORNICATIONS17
- UNIFICATIONS17
- UNIFORMITIES17
- GLUCURONIDES16
- NONINTRUSIVE15
- UNINSTRUCTED15
- ELOCUTIONIST14
- KERATINIZING26
- KINNIKINNICK26
- SUBURBANIZED26
- DODECAPHONIC23
- SUBCOMMUNITY23
- DISCERNINGLY19
- BARBARIANISM18
- DISHARMONIES18
- NONCOGNITIVE18
- ORNITHOPTERS17
- PERFUSIONIST17
- SUPERVENIENT17
- QUINQUENNIUM32
- MECHANIZABLE30
- OZONIZATIONS30
- QUADRIPHONIC29
- UNMECHANIZED29
- DEFEMINIZING28
- HEATHENIZING28
- TECHNICALIZE28
- ZOOTECHNICAL28
- CIVILIANIZED27
- DECARBONIZED27
- DISHARMONIZE27
- FICTIONIZING27
- HOMOGENIZERS27
- MUNICIPALIZE27
- PHOTOIONIZED27
- PHYCOCYANINS27
- REHUMANIZING27
- SCHIZOGONIES27
- TRICHINIZING27
- XYLOPHONISTS27
- ALKALINIZING26
- BITUMINIZING26
- CIVILIANIZES26
- DECARBONIZER26
- DECARBONIZES26
- DEFINITIZING26
- HOMINIZATION26
- INCOGNIZANCE26
- LYSOGENIZING26
- PHOTOIONIZES26
- RHIZOCTONIAS26
- VULCANIZATES26
- CHURCHIANITY25
- COMMUNICABLY25
- GRECIANIZING25
- HYPERSTHENIC25
- HYPOTONICITY25
- MASCULINIZES25
- OVERORGANIZE25
- PORCELAINIZE25
- SKELETONIZER25
- SKELETONIZES25
- SUBURBANIZES25
- TOXIGENICITY25
- UNMODERNIZED25
- COLONIALIZED24
- CYCLONICALLY24
- FRATERNIZERS24
- HEATHENISHLY24
- HEBEPHRENICS24
- HYDRONICALLY24
- HYPERCAPNIAS24
- INDIGENIZING24
- INIQUITOUSLY24
- MAGNILOQUENT24
- MISSIONIZING24
- MYTHOMANIACS24
- NYMPHOMANIAS24
- PHOSPHONIUMS24
- PRUSSIANIZED24
- QUADRENNIUMS24
- RECOLONIZING24
- UNNILHEXIUMS24
- UNNILQUADIUM24
- AMPHISBAENIC23
- BIUNIQUENESS23
- COLONIALIZES23
- DESALINIZING23
- DISORGANIZES23
- EQUANIMITIES23
- GELATINIZING23
- MAGNIFICALLY23
- MELANIZATION23
- MICROTECHNIC23
- MINIATURIZES23
- MISSIONIZERS23
- NIGHTCLUBBED23
- OUTORGANIZED23
- PRUSSIANIZES23
- PYROGENICITY23
- SCRUTINIZERS23
- SECTARIANIZE23
- SIGNIFICANCY23
- ANOREXIGENIC22
- ASYNCHRONISM22
- ATTITUDINIZE22
- BRONCHOGENIC22
- COMPUTERNIKS22
- CUPRONICKELS22
- EUPHONICALLY22
- HEBEPHRENIAS22
- HYPOLIMNIONS22
- ITALIANIZING22
- JUVENILITIES22
- NIGHTCLUBBER22
- NINNYHAMMERS22
- NONUNIONIZED22
- OUTORGANIZES22
- PHILHELLENIC22
- PYROTECHNIST22
- QUADRENNIALS22
- REORGANIZERS22
- SACCHARINITY22
- SYNCHRONICAL22
- SYNCHRONISMS22
- UNISEXUALITY22
- AQUILINITIES21
- BOHEMIANISMS21
- DIFFUSIONISM21
- ETERNIZATION21
- EXCURSIONIST21
- GALVANICALLY21
- INFINITIVELY21
- LEUKEMOGENIC21
- LIONIZATIONS21
- LYSOGENICITY21
- MECHANICIANS21
- MENINGOCOCCI21
- MISRECKONING21
- MNEMONICALLY21
- MUNIFICENCES21
- NONCOMMUNITY21
- PANTECHNICON21
- PLANISPHERIC21
- POSTMIDNIGHT21
- PYROMANIACAL21
- QUATERNITIES21
- RABBINICALLY21
- SEMIFINISHED21
- SNIFFISHNESS21
- SOLEMNIFYING21
- STAPHYLINIDS21
- TETANIZATION21
- UNIQUENESSES21
- UNITIZATIONS21
- AMBLYGONITES20
- ASYNCHRONIES20
- BIBLIOMANIAC20
- CHAIRMANNING20
- CHALCEDONIES20
- CLOWNISHNESS20
- COMMUNICATEE20
- CONIDIOPHORE20
- COUNCILMANIC20
- DEMONIACALLY20
- DIMINISHABLE20
- DISFURNISHED20
- ECUMENICISMS20
- EMBRYOGENIES20
- EUPHONIOUSLY20
- FORAMINIFERS20
- FORETOKENING20
- HETERODYNING20
- KLEPTOMANIAS20
- KNIGHTLINESS20
- MITOGENICITY20
- MOLYBDENITES20
- NONHAPPENING20
- NONINFECTIVE20
- OMNIVOROUSLY20
- ONCOGENICITY20
- PICKANINNIES20
- PREMONISHING20
- PREVENIENTLY20
- UNCHRONICLED20
- WOMANISHNESS20
- ANIMADVERTED19
- ANTIHUMANISM19
- CALIFORNIUMS19
- CALUMNIOUSLY19
- CATIONICALLY19
- CHRONICITIES19
- COCAPTAINING19
- COMPANIONING19
- COSMOGONICAL19
- DIFFUSIONIST19
- DIPSOMANIACS19
- DISFURNISHES19
- FRANKLINITES19
- HARMONICISTS19
- HEARTENINGLY19
- IMPENITENTLY19
- INCONCINNITY19
- ISOCHRONISMS19
- MANIPULATORY19
- MISGOVERNING19
- MONITORSHIPS19
- NEPHELINITIC19
- NONVANISHING19
- OMNIPOTENTLY19
- OMNISCIENTLY19
- PANDEMONIUMS19
- PHILLUMENIST19
- PLANISPHERES19
- PLASTOCYANIN19
- PRESIGNIFIED19
- PROVENIENCES19
- REFRESHENING19
- SAPONIFIABLE19
- SEMPITERNITY19
- SIMONIACALLY19
- SOMNIFACIENT19
- SPERMAGONIUM19
- SUBSONICALLY19
- TECHNETRONIC19
- TYMPANITESES19
- UNICAMERALLY19
- YESTERNIGHTS19
- ADMONITORILY18
- ANNIHILATORY18
- ARCHEGONIATE18
- BIBLIOMANIAS18
- CANNIBALISMS18
- DEVIATIONISM18
- DIABETOGENIC18
- DIATONICALLY18
- DIVISIONISMS18
- ECUMENICISTS18
- HEARTBURNING18
- HOOLIGANISMS18
- IGNITABILITY18
- IMPENITENCES18
- INDEMNIFIERS18
- MANIFESTOING18
- MANIFOLDNESS18
- MARATHONINGS18
- MISBEGINNING18
- NIDIFICATION18
- NONCOMMUNIST18
- NONINCUMBENT18
- NONINDUCTIVE18
- NONMUNICIPAL18
- OMNIPOTENCES18
- OMNISCIENCES18
- OPPORTUNISMS18
- ORNITHOLOGIC18
- OVERCLEANING18
- OVERPLANNING18
- PALEOBOTANIC18
- PLEBEIANISMS18
- PRESIGNIFIES18
- PREVISIONING18
- SNICKERSNEES18
- SNIFFINESSES18
- SNIPERSCOPES18
- SPAGHETTINIS18
- SWAINISHNESS18
- TRUNCHEONING18
- TYRANNICIDES18
- VAGINISMUSES18
- VESUVIANITES18
- ADOPTIANISMS17
- ADOPTIONISMS17
- ANTIFEMININE17
- BENIGNANCIES17
- BRAWNINESSES17
- CALUMNIATING17
- CAPARISONING17
- CARDIOTONICS17
- CENTENNIALLY17
- CHANSONNIERS17
- CHLORINITIES17
- CHRISTIANIAS17
- CLANNISHNESS17
- COSMOGONISTS17
- DETERMINISMS17
- DISBURDENING17
- ENCRIMSONING17
- EUDAEMONISMS17
- EUDAIMONISMS17
- FEMININENESS17
- GALLINIPPERS17
- GARNISHEEING17
- GEOBOTANICAL17
- IMPASSIONING17
- INFLATIONISM17
- INHUMANITIES17
- INTERKNITTED17
- ISOTONICALLY17
- LYSOGENISING17
- MANDARINISMS17
- MANIFESTANTS17
- MASCULINISED17
- MEGALOMANIAS17
- MENINGIOMATA17
- MISBUTTONING17
- NEPHELINITES17
- NIACINAMIDES17
- NONFEMINISTS17
- NONIMITATIVE17
- NONINFLUENCE17
- OPINIONATIVE17
- PERSONIFIERS17
- PRIMOGENITOR17
- PUNITIVENESS17
- REPLENISHERS17
- RETIGHTENING17
- REVISIONISMS17
- SALVATIONISM17
- SARDONICISMS17
- SEPTENNIALLY17
- SKELETONISED17
- SMITHSONITES17
- SUBURBANISED17
- SUPERORGANIC17
- SUSPICIONING17
- TELEPHONISTS17
- TOBOGGANINGS17
- VACATIONISTS17
- VINICULTURES17
- VULCANISATES17
- ALGOLAGNIACS16
- ALKALINITIES16
- AMMONIATIONS16
- ANISEIKONIAS16
- ANISOTROPISM16
- BALLETOMANIA16
- BIMILLENNIAL16
- CALUMNIATION16
- CALUMNIATORS16
- CANNIBALISES16
- CANONICITIES16
- COLONIALISMS16
- COLUMNIATION16
- CONCINNITIES16
- CRANIOTOMIES16
- CREATIONISMS16
- CUNNILINCTUS16
- DENITRIFIERS16
- DEVIATIONIST16
- DISINCLINING16
- DIVERSIONIST16
- DIVISIONISTS16
- ELECTROTONIC16
- FOURDRINIERS16
- GRANITEWARES16
- GREENISHNESS16
- HETEROGENIES16
- HETEROGONIES16
- LIBERTINISMS16
- MASCULINISES16
- MENINGITIDES16
- MISCELLANIST16
- NIMBLENESSES16
- NONFATTENING16
- OPERATIONISM16
- OVERLEARNING16
- POSITRONIUMS16
- PREASSIGNING16
- PREDESTINING16
- PREMUNITIONS16
- PREORDAINING16
- REENTHRONING16
- SANCTIMONIES16
- SEMICOLONIAL16
- SEMICOLONIES16
- SKELETONISES16
- SKINNINESSES16
- SUBMINISTERS16
- SUBURBANISES16
- TOBOGGANISTS16
- TRAMPOLINIST16
- UNNILPENTIUM16
- WESTERNISING16
- ACETANILIDES15
- ADMINISTRANT15
- ADOPTIONISTS15
- AGRARIANISMS15
- BASERUNNINGS15
- CARILLONNING15
- CARRAGEENINS15
- CRANIOLOGIES15
- EPEIROGENIES15
- EUDAEMONISTS15
- FINITENESSES15
- GEOBOTANISTS15
- GONIOMETRIES15
- GUTTERSNIPES15
- HOOTENANNIES15
- INFINITENESS15
- INFLATIONIST15
- ISOANTIGENIC15
- LANGBEINITES15
- MANDOLINISTS15
- NONANTIGENIC15
- NONIDENTICAL15
- NONINTUITIVE15
- NONUNIVERSAL15
- OLIGOPSONIES15
- ORGANICITIES15
- OUTDESIGNING15
- PREIGNITIONS15
- PRUSSIANISED15
- RATAPLANNING15
- REMOISTENING15
- REPATTERNING15
- SELENIFEROUS15
- SINFONIETTAS15
- SUNSCREENING15
- TENEBRIONIDS15
- THORNINESSES15
- TITANIFEROUS15
- TURPENTINING15
- UNIFOLIOLATE15
- UNINOCULATED15
- VENIALNESSES15
- ANILINCTUSES14
- BRAININESSES14
- COALITIONIST14
- COLONIALNESS14
- DENIGRATIONS14
- EINSTEINIUMS14
- ENSANGUINING14
- ILLUSIONISMS14
- IRONICALNESS14
- LACINIATIONS14
- NONBOTANISTS14
- NONINCLUSION14
- NONINSURANCE14
- NONIRRIGATED14
- NONUNANIMOUS14
- OPERATIONIST14
- PARTITIONIST14
- PRUSSIANISES14
- REANIMATIONS14
- REUNIONISTIC14
- SEIGNIORAGES14
- SELECTIONIST14
- SILLIMANITES14
- TENDINITIDES14
- TENDONITIDES14
- TRANSURANICS14
- UNDERRUNNING14
- UNINTEGRATED14
- ATTITUDINISE13
- DISUNIONISTS13
- GRAININESSES13
- INTERLININGS13
- ITALIANISING13
- NITROGENASES13
- REINITIATING13
- SANGUINITIES13
- TENDINITISES13
- TENDONITISES13
- UNILLUSIONED13
- URINOGENITAL13
- INSANITATION12
- NONINITIATES12
- NONINTERESTS12
- SINISTERNESS12
- STRONTIANITE12
Related word lists
Questions people ask
About this list
Our word list is ENABLE, first published in 2000 and still used by most word games.
Meanings come from Princeton WordNet (2011). How common a word is comes from wordfreq.
Look up ORGANIZATION in Merriam-Webster, Wiktionary, Collins or Dictionary.com. Check it for Scrabble at Merriam-Webster Scrabble.
FAQ
How many 12 letter words with NI in them?
Our dictionary has 757 12-letter words containing NI. It is based on the ENABLE word list used by most word games.
What is the most common 12 letter word containing NI?
ORGANIZATION is the most common in everyday English, followed by UNIVERSITIES, ORGANISATION, SIGNIFICANCE.
What 12 letter word containing NI scores the most in Scrabble?
QUINQUENNIUM scores 32 points before bonus squares (39 in Words With Friends).