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