There are 439 fifteen-letter words containing A, O, R, S and U, https://www.bestwordlist.com/c/a/5/15letterwordswithaorsu.htm ACRIMONIOUSNESS ADVENTUROUSNESS AGRANULOCYTOSES AGRANULOCYTOSIS ALUMINOTHERMIES AMARYLLIDACEOUS AMORPHOUSNESSES ANDROMONOECIOUS ANFRACTUOSITIES ANGUSTIROSTRATE ANTHROPOPHAGOUS ANTHROPOPHUISMS ANTIFORECLOSURE ANTITUBERCULOUS APPROPINQUITIES ARBORICULTURIST ASTRONAUTICALLY ATRABILIOUSNESS ATROCIOUSNESSES AUDIOMETRICIANS AUTOBIOGRAPHERS AUTOBIOGRAPHIES AUTODESTRUCTING AUTODESTRUCTIVE AUTORADIOGRAPHS AUTOTETRAPLOIDS AUTOTRANSFORMER AUTOTRANSFUSION BACTERIOPHAGOUS BARBAROUSNESSES BIOASTRONAUTICS BRACHIOSAURUSES BRACHYCEPHALOUS BRACHYDACTYLOUS CAPRIFOLIACEOUS CARNIVOROUSNESS CARPOMETACARPUS CENTRIFUGATIONS CEREBROVASCULAR CHEMOAUTOTROPHS CHONDROCRANIUMS CHROMATOPHOROUS CIRCULARISATION CIRCUMAMBAGIOUS CIRCUMFORANEOUS CIRCUMGYRATIONS CIRCUMNUTATIONS CLAMOROUSNESSES CLAUSTROPHILIAS CLAUSTROPHOBIAS COLOURABILITIES COLOURISTICALLY COMMENSURATIONS COMPUTERISATION COMPUTERPHOBIAS CONCEPTUALISERS CONCEPTUALIZERS CONGLOMERATEURS CONGRATULATIONS CONNATURALISING CONNATURALITIES CONQUERABLENESS CONSERVATORIUMS CONTEMPERATURES CONTEMPORANEOUS CONTRAPUNTALIST CONTRARIOUSNESS CONVULSIONARIES CORPUSCULARIANS COTRANSDUCTIONS COUNTERASSAULTS COUNTERBALANCES COUNTEREXAMPLES COUNTERFACTUALS COUNTERFEISANCE COUNTERFESAUNCE COUNTERINSTANCE COUNTERINVASION COUNTERMEASURES COUNTERPROPOSAL COUNTERSHADINGS COUNTERSTAINING COUNTERSTRATEGY CRAPULOUSNESSES CUSTOMARINESSES CYTOMEGALOVIRUS DAGUERREOTYPERS DAGUERREOTYPIES DAGUERREOTYPIST DANGEROUSNESSES DECARBURISATION DECOLOURISATION DESULFURISATION DESULFURIZATION DESULPHURATIONS DEUTERANOMALIES DEUTERANOMALOUS DISARTICULATION DISARTICULATORS DISATTRIBUTIONS DISCOLOURATIONS DISCOURAGEMENTS DISHARMONIOUSLY DISQUISITIONARY DOCUMENTARISING DOLICHOSAURUSES DOWNREGULATIONS DRAUGHTSPERSONS EBURNIFICATIONS ECCREMOCARPUSES ECHINODERMATOUS EDRIOPHTHALMOUS ELECTROACOUSTIC ELECTROSURGICAL ELEUTHEROMANIAS ENANTIOMORPHOUS ENCHONDROMATOUS EQUIPONDERANCES EUTROPHICATIONS EXCLAUSTRATIONS EXCOMMUNICATORS FERROPRUSSIATES FISSIPAROUSNESS FLAVOURDYNAMICS FLIRTATIOUSNESS FLUOROPHOSPHATE FORMULARISATION FORTUNATENESSES FRACTIOUSNESSES FRUCTIFICATIONS FURACIOUSNESSES GARRULOUSNESSES GLAMOROUSNESSES GRANDILOQUENCES GRANULITISATION GROUNDBREAKINGS GUTTURALISATION HAZARDOUSNESSES HEMOGLOBINURIAS HETERODACTYLOUS HETEROSEXUALITY HILARIOUSNESSES HONOURABILITIES HYDROCEPHALUSES HYPERFASTIDIOUS HYPOPITUITARISM ICHTHYOSAURIANS ICHTHYOSAURUSES IMMUNOREACTIONS IMMUNOTHERAPIES IMPERTURBATIONS IMPORTUNATENESS INARTICULATIONS INCOMMENSURABLE INCOMMENSURABLY INQUISITORIALLY INSTRUMENTATION INSUBORDINATELY INSUBORDINATION INSURRECTIONARY INTERBEHAVIOURS INTEROSCULATING INTEROSCULATION INVOLUNTARINESS JOURNALISATIONS JOURNALIZATIONS LABORIOUSNESSES LACTIFEROUSNESS MACROEVOLUTIONS MACROSPORANGIUM MACROSTRUCTURAL MACROSTRUCTURES MALDISTRIBUTION MARGARITIFEROUS MARVELOUSNESSES MENISPERMACEOUS MERCAPTOPURINES METHOXYFLURANES MICROPULSATIONS MICROSPORANGIUM MICROSTRUCTURAL MINIATURISATION MINICALCULATORS MISARTICULATION MISATTRIBUTIONS MISGOVERNAUNCES MONOUNSATURATED MONOUNSATURATES MOUNTAINEERINGS MOUNTEBANKERIES MULTIPOLARITIES MUSICOTHERAPIES NATURALISATIONS NATURALIZATIONS NEFARIOUSNESSES NEUROANATOMISTS NEUROBLASTOMATA NEUROMARKETINGS NEUROPLASTICITY NEUROPSYCHIATRY NEUROSURGICALLY NEUTRALISATIONS NEUTRALIZATIONS NONBARBITURATES NONDURABILITIES NONHETEROSEXUAL NONINSTRUMENTAL NONSPECTACULARS NONUTILITARIANS NUCLEARISATIONS NUCLEARIZATIONS OBSTRUCTIONALLY OMNIFARIOUSNESS ORACULOUSNESSES OSMOREGULATIONS OUTDOORSMANSHIP OVERACCENTUATES OVERADJUSTMENTS OVERAMBITIOUSLY OVERARTICULATES OVERENTHUSIASMS OVEREVALUATIONS OVERGLAMOURIZES OVERPERSUASIONS OVERPOPULATIONS OVERREGULATIONS OVERSATURATIONS OVERSPECULATING OVERSPECULATION OVERSTIMULATING OVERSTIMULATION OVERUTILISATION OVERZEALOUSNESS OVOVIVIPAROUSLY OXIDOREDUCTASES PARAJOURNALISMS PARAMYXOVIRUSES PARTHENOCARPOUS PASSIFLORACEOUS PASTEURISATIONS PASTEURIZATIONS PERGAMENTACEOUS PERSPICACIOUSLY PHENYLTHIOUREAS PHOTOAUTOTROPHS PHOTOJOURNALISM PHOTOJOURNALIST PITHECANTHROPUS PNEUMATOMETRIES POCOCURANTEISMS POLYUNSATURATED POLYUNSATURATES POPULARISATIONS POPULARIZATIONS POSTGRADUATIONS POSTSTIMULATORY POSTTRANSFUSION PREPUBLICATIONS PRESSURISATIONS PRESSURIZATIONS PROCELEUSMATICS PROCURATORSHIPS PRONUNCIAMENTOS PROSENCHYMATOUS PROTOSPATHARIUS PRUSSIANISATION PRUSSIANIZATION PSEUDEPIGRAPHON PSEUDOARTHROSES PSEUDOARTHROSIS PSEUDOMEMBRANES PSEUDOPREGNANCY QUARRELSOMENESS QUATTROCENTISMS QUATTROCENTISTS QUODLIBETARIANS RADICULOPATHIES RADIOAUTOGRAPHS RADIOPHOSPHORUS RADIOSTRONTIUMS RANCOROUSNESSES RAPACIOUSNESSES RAPTUROUSNESSES REARTICULATIONS REAUTHORISATION RECAPITULATIONS RECONCEPTUALISE RECONSTITUTABLE RECONTEXTUALISE REDOUBTABLENESS REGULARISATIONS REGULARIZATIONS REHUMANIZATIONS REPROACHFULNESS REPUDIATIONISTS RESURRECTIONARY REVISUALISATION REVISUALIZATION REVOLUTIONARIES RHEUMATOLOGISTS ROUNDHEADEDNESS SANSCULOTTERIES SARCENCHYMATOUS SARRACENIACEOUS SAUROPTERYGIANS SCLERODERMATOUS SCRIBACIOUSNESS SECULARISATIONS SECULARIZATIONS SECURITISATIONS SECURITIZATIONS SEMIDOCUMENTARY SESQUICARBONATE SHOCKUMENTARIES SINGULARISATION SINGULARIZATION SLAUGHTERHOUSES SLUMPFLATIONARY SOCIOCULTURALLY SOLITUDINARIANS SOUTHEASTERLIES SOUTHEASTERNERS SOUTHWESTWARDLY STRATICULATIONS STREPTOBACILLUS STREPTOCARPUSES SUBAGGREGATIONS SUBALTERNATIONS SUBCATEGORISING SUBCATEGORIZING SUBCONTRACTINGS SUBCONTRAOCTAVE SUBORDINATENESS SUBORGANISATION SUBORGANIZATION SUBPROFESSIONAL SUBPROLETARIATS SUBSTITUTIONARY SUBSTRATOSPHERE SUBTERRANEOUSLY SUBURBANISATION SUBURBANIZATION SUBVERSIONARIES SULFINPYRAZONES SULPHINPYRAZONE SULPHURISATIONS SULPHURIZATIONS SUPERABSORBENTS SUPERADDITIONAL SUPERANNUATIONS SUPERCARGOSHIPS SUPERELEVATIONS SUPEREROGATIONS SUPEREXALTATION SUPERFOETATIONS SUPERMAJORITIES SUPERNATIONALLY SUPERORDINATING SUPERORDINATION SUPERORGANICISM SUPERORGANICIST SUPEROVULATIONS SUPERPATRIOTISM SUPERPHOSPHATES SUPERSATURATION SUPPORTABLENESS SUPRANATIONALLY SUSPERCOLLATING TABULARISATIONS TABULARIZATIONS TARSOMETATARSUS TELAUTOGRAPHIES TELEJOURNALISMS TELEJOURNALISTS TEMERARIOUSNESS TENTACULIFEROUS TETRASPORANGIUM THAUMATOLATRIES THERMOREGULATES TRANQUILISATION TRANSFIGURATION TRANSFUSIONISTS TRANSMUTATIONAL TRANSVALUATIONS TRAUMATISATIONS TRAUMATIZATIONS TRAUMATONASTIES TREACHEROUSNESS TUBERCULISATION TURBOGENERATORS TYRANNOSAURUSES TYRANNOUSNESSES ULTRAFASTIDIOUS ULTRAMICROSCOPE ULTRAMICROSCOPY ULTRAMICROTOMES ULTRAMODERNISMS ULTRAMODERNISTS ULTRAMONTANISMS ULTRAMONTANISTS ULTRAPRECISIONS ULTRASONOGRAPHY UNADVENTUROUSLY UNAPPRECIATIONS UNCATEGORISABLE UNCOMPROMISABLE UNCONSTRAINABLE UNCONSTRAINEDLY UNCONTROVERSIAL UNDEMONSTRATIVE UNDERDIAGNOSING UNDERESTIMATION UNDERINFLATIONS UNDERVALUATIONS UNFAVORABLENESS UNFORTUNATENESS UNIFORMITARIANS UNORIGINALITIES UNPROFESSIONALS UNPROTESTANTISE UNPROTESTANTIZE UNSAVOURINESSES UNSEAWORTHINESS UNSPORTSMANLIKE UNWORKABILITIES UTEROGESTATIONS VAPOURABILITIES VAPOURISHNESSES VASCULARISATION VASCULARIZATION VERACIOUSNESSES VICARIOUSNESSES VIRTUALISATIONS VIRTUALIZATIONS VOLUNTARINESSES VORACIOUSNESSES VOYEURISTICALLY WATERCOLOURISTS ZINJANTHROPUSES