18 Letter Words Containing O
There are 486 18-letter words containing O, listed alphabetically. Every entry is a valid play in Scrabble and Words With Friends, sorted so you can scan them quickly. Tap any word to open its definition, see exactly how many points it scores on each board, and discover the anagrams and shorter words hiding inside it.
486 words
adenocarcinomatous25advantageousnesses23aerothermodynamics31agammaglobulinemia28agammaglobulinemic30anagrammatizations32angiocardiographic30anthropocentricity30anthropomorphizing40antiadministration21anticholinesterase23anticommercialisms28anticounterfeiting24antidiscrimination23antiferromagnetism26antivivisectionist26archaeoastronomies25astrophotographers29astrophotographies29australopithecines25autobiographically31bacteriorhodopsins28biocompatibilities28biodegradabilities25biotransformations25bloodthirstinesses24bourgeoisification26bureaucratizations31cantankerousnesses24chlorofluorocarbon30chlortetracyclines30cholecystectomized42chromolithographed35chromolithographer34chromolithographic36claustrophobically32coccidioidomycoses33coccidioidomycosis33collectivistically30commensurabilities26commercializations35communicablenesses28companionabilities26compartmentalising27compartmentalizing36comprehensibleness29conceptualizations33congregationalisms24congregationalists22consequentialities29conservativenesses26constitutionalisms22constitutionalists20constitutionalized30constitutionalizes29constructivenesses25consubstantiations22contemptiblenesses26contemptuousnesses24contradistinctions23conversationalists23counteraccusations24counteradaptations23counteradvertising25counteraggressions22counterconventions25counterculturalism24counterdemonstrate23counterdeployments28countereducational23countergovernments26counterinfluencing26counterinstitution20counterintuitively26counterpetitioning23counterprogramming28counterpropagandas26counterquestioning30counterreformation25counterretaliation20counterrevolutions23counterstrategists21countersuggestions22creditworthinesses27curmudgeonlinesses24deconstructionists23decriminalizations32dedifferentiations26dehydrochlorinases31dehydrochlorinated32dehydrochlorinates31deinstitutionalize28dematerializations30demythologizations37denationalizations28dendrochronologies26dendrochronologist26denominationalisms23deoxyribonucleases33depersonalizations30dephosphorylations32dextroamphetamines35diastereoisomerism23diethylstilbestrol27dihydroergotamines29diphenylhydantoins34disconnectednesses24disconsolatenesses21discontentednesses22discourteousnesses21dishonorablenesses24disingenuousnesses20disintermediations22disproportionately26disproportionating24disproportionation23disputatiousnesses21echocardiographers32echocardiographies32electrocardiograms26electrocardiograph29electrochemistries27electrocorticogram27electrodepositions23electrodesiccation25electrodynamometer28electroluminescent24electromyographies31electrooculography31electrophilicities27electrophoretogram28electrophotography34electrophysiologic31electroretinograms23electroretinograph26epithelializations32ethnomethodologies28ethnomethodologist28ethnomusicological28ethnomusicologists26evapotranspiration25exceptionabilities31expressionlessness27extemporaneousness29exterritorialities25ferroelectricities25forethoughtfulness31fractionalizations32gastroenterologies20gastroenterologist20geochronologically30glomerulonephritis26glottochronologies25glycosaminoglycans32granulocytopoieses26granulocytopoiesis26hemoglobinopathies31histocompatibility32histophysiological32homoscedasticities28hydroelectricities29hydrometallurgical30hydrometallurgists28hydrometeorologies28hydrometeorologist28hydroxytryptamines42hyperalimentations28hypercoagulability34hyperconcentration30hyperconsciousness30hypercorrectnesses30hyperimmunizations39hypernationalistic28hyperpigmentations31hyperpolarizations37hyperrationalities26hypersensitization35hypoparathyroidism37hypophysectomizing48hyposensitizations35immunocytochemical36immunodeficiencies30immunofluorescence29immunohematologies28immunohematologist28immunopathological30immunopathologists28immunoprecipitated29immunoprecipitates28immunoreactivities27immunosuppressants26immunosuppressions26impersonalizations31inauspiciousnesses22incombustibilities26incommensurability29incommodiousnesses25inconceivabilities27inconclusivenesses25inconsequentiality32inconsiderableness23inconsolablenesses22incontestabilities22inconvertibilities25incorrigiblenesses23incorruptibilities24indissolublenesses21individualizations32industrializations28inharmoniousnesses23inhospitablenesses25institutionalising19institutionalizing28intercolumniations22intercommunicating27intercommunication26interconnectedness23interinstitutional18internationalising19internationalities18internationalizing28interoperabilities22interrelationships23introspectionistic24irreconcilableness24irreproachableness27irresponsibilities22irresponsivenesses23knowledgeabilities29lepidopterological26lepidopterologists24lipopolysaccharide33lumpenproletariats24lymphangiographies35macroglobulinemias27macrophotographies33magnetoresistances23magnetostrictively29maladministrations23malcontentednesses23mechanochemistries32melodramatizations32meretriciousnesses22metallographically31methemoglobinemias30methylcholanthrene34methylprednisolone29microcalorimetries26microcrystallinity30microdensitometers25microdensitometric27microencapsulating27microencapsulation26microenvironmental27microlepidopterous27micromanipulations26micrometeorologies25micrometeorologist25micromorphological32micropaleontologic27microphotographers33microphotographies33microradiographies29microreproductions27mineralocorticoids25misadministrations23misclassifications27misidentifications26misinterpretations22misrepresentations22monochromaticities29mucopolysaccharide35multifariousnesses23myeloproliferative31neuroendocrinology25neuropharmacologic30neurophysiological29neurophysiologists27neuropsychiatrists28neuropsychological31neuropsychologists29neurotransmissions20nonanthropological26nonanthropologists24nonarbitrarinesses20noncommutativities27noncomparabilities26nonconfrontational23noncooperationists22nondeductibilities24nondestructiveness24nondiscriminations23nonfraternizations30noninterchangeable26noninterventionist21nonrepresentatives23nonrevolutionaries21obstreperousnesses22ophthalmologically34opinionativenesses23organophosphoruses29orthogonalizations31orthopsychiatrists31oscillographically31ostentatiousnesses18otherworldlinesses25overcapitalization34overcentralization32overclassification28overcommercialized39overcommercializes38overcommunications29overconcentrations25overembellishments30overextrapolations30overfertilizations33overgeneralization31overidentification27overindebtednesses25overindustrialized32overindustrializes31overinterpretation23overoptimistically30overprotectiveness28overrepresentation23oversimplification30overspecialization34ovolactovegetarian27paleoclimatologies25paleoclimatologist25particularizations31pathophysiological34pentachlorophenols30pentylenetetrazols32perchloroethylenes31pertinaciousnesses22phenomenologically31pheochromocytomata37phonocardiographic34phosphodiesterases29phosphoglucomutase33photodecomposition30photodisintegrated26photodisintegrates25photodissociations26photolithographies32photolithographing33photomicrographies33photomorphogeneses31photomorphogenesis31photoreactivations28photoreproductions28photosensitivities26photosensitization32photosynthetically34physiopathological34phytohemagglutinin33piezoelectricities33polyacrylonitriles28polychromatophilia35polychromatophilic37polyesterification28polymorphonuclears32polyribonucleotide28postmillenarianism24postmillennialisms24postmillennialists22postpsychoanalytic35praiseworthinesses26preposterousnesses22presumptuousnesses24proletarianization29pronounceabilities24propagandistically29propertylessnesses25provincializations34pseudonymousnesses26pseudoparenchymata33pseudotuberculoses25pseudotuberculosis25psychoanalytically36psychobiographical38psychopathological36psychopathologists34psychopharmacology41psychophysiologies37psychophysiologist37quantificationally35quasiperiodicities32quattuordecillions30questionablenesses29radiochromatograms29radiosensitivities22rambunctiousnesses24rechromatographies31rechromatographing32reconstructionisms24reconstructionists22recrystallizations32redistributionists21rehospitalizations32reinstitutionalize27renationalizations27representationally23revascularizations32rhabdomyosarcomata33ribonucleoproteins24roentgenologically25sacrilegiousnesses21satisfactorinesses23sedimentologically27semiconservatively31semidomestications25semiprofessionally28sentimentalization29shortsightednesses26simultaneousnesses20sociopsychological33somnambulistically29soporiferousnesses23spectrofluorimeter27spectrofluorometer27spectrofluorometry30spectrographically33spectroheliographs31spectroheliography34spectrohelioscopes29spectrophotometers29spectrophotometric31sphygmomanometries33stereophotographic31stereoregularities19stereospecifically30stoichiometrically30stoutheartednesses22structuralizations29subcategorizations32subclassifications27subconsciousnesses24submicroscopically33superadministrator23superciliousnesses22supercivilizations34superconglomerates25superminicomputers28supersophisticated28supranationalities20tachistoscopically32telecommunications26territorialization27theatricalizations32thermoluminescence29thermoplasticities27thrombophlebitides33transformationally26transilluminations20transistorizations27transmogrification26transportabilities22transubstantiation20triboelectricities24triboluminescences26trichloroethylenes29triskaidekaphobias34ultraconservatisms25ultraconservatives26ultramicroscopical28ultranationalistic20ultrarevolutionary24ultrasophisticated26unaccountabilities24uncompromisingness27unconscionableness24unconstitutionally23unconvincingnesses26uniformitarianisms25unprofitablenesses25unreasonablenesses20unresponsivenesses23unsatisfactoriness23unscrupulousnesses22unseasonablenesses20vaingloriousnesses22verisimilitudinous24videoconferencings30weatherproofnesses29
Containing O by length
2 letters 243 letters 2314 letters 10535 letters 25336 letters 47807 letters 79508 letters 114039 letters 1121910 letters 1017611 letters 858512 letters 696513 letters 519314 letters 357615 letters 234016 letters 142617 letters 88918 letters 48619 letters 28920 letters 14721 letters 5522 letters 2523 letters 1024 letters 9