There are 546 thirteen-letter words containing A, 2S, T and U, https://www.bestwordlist.com/c/a/5/13letterwordswithasstu.htm ABSQUATULATES ACCUSTREMENTS ADVENTURESSES AEROACOUSTICS ALUMINOSITIES AMBITIOUSNESS AMPULLOSITIES ANIMALCULISTS ANTIHUMANISMS ANTIHUMANISTS ANTINAUSEANTS ANTIQUENESSES APATOSAURUSES APFELSTRUDELS APICULTURISTS APOSTROPHUSES AQUAFITNESSES ARTHROSPOROUS ASSUBJUGATING ASSUEFACTIONS ASTROTOURISMS ASTROTOURISTS ASTROTURFINGS ATROCIOUSNESS ATTITUDINISES AUDIOCASSETTE AUDIOMETRISTS AUREATENESSES AUSCULTATIONS AUSTERENESSES AUTOCATALYSES AUTOCATALYSIS AUTODESTRUCTS AUTOEXPOSURES AUTOMOBILISMS AUTOMOBILISTS AUTOMORPHISMS AUTORICKSHAWS AUTOSCHEDIASM AUTOSUGGESTED AVICULTURISTS BEAUTEOUSNESS BEAUTIFULNESS BEHAVIOURISTS BISEXUALITIES BLASTULATIONS BREASTPLOUGHS BREASTSUMMERS BUOYANTNESSES CALYCANTHUSES CARICATURISTS CASUALISATION CASUISTICALLY CAUSABILITIES CAUSATIONISMS CAUSATIONISTS CAUSATIVENESS CAUSTICNESSES CETEOSAURUSES CHAPTERHOUSES CHIAROSCURIST CHORUSMASTERS CIRCUMSTANCES CLAUSTRATIONS CLEISTOGAMOUS COADJUTRESSES COAUTHORSHIPS CONJUGATENESS CONQUISTADORS CONSECTANEOUS CONSENTANEOUS CONSULTANCIES CONSULTATIONS CONSUMMATIONS CONTINUALNESS CONTRASEXUALS COSURFACTANTS COUNTERBLASTS COUNTERSCARPS COUNTERSHAFTS COUNTERSTAINS COUNTERSTATES CRAPULOSITIES CREATURESHIPS CUMULOSTRATUS CURARISATIONS CUSTODIANSHIP CUSTOMARINESS CUSTOMISATION CUTINISATIONS DARMSTADTIUMS DAUNTLESSNESS DECRUSTATIONS DENATURALISES DEPUTISATIONS DESATURATIONS DESQUAMATIONS DESULPHURATES DEUTEROPLASMS DISACCUSTOMED DISADVENTURES DISAMBIGUATES DISANNULMENTS DISAUTHORISED DISAUTHORISES DISAUTHORIZES DISCEPTATIOUS DISNATURALISE DISQUANTITIES DISSIMULATING DISSIMULATION DISSIMULATIVE DISSIMULATORS DISTASTEFULLY DRAMATURGISTS EDUCATIONESES EDUCATIONISTS EFFECTUALNESS EMASCULATIONS EMPHYSEMATOUS ENCRUSTATIONS EQUALISATIONS EQUESTRIANISM EQUIDISTANCES EQUISETACEOUS EQUITABLENESS ERYSIPELATOUS EUSOCIALITIES EUTHANASIASTS EXHAUSTLESSLY EXPOSTULATORS EXSANGUINATES EXSUFFLATIONS FACETIOUSNESS FACTUALNESSES FATEFULNESSES FATUOUSNESSES FAULTLESSNESS FLAUNTINESSES FLUIDISATIONS FORTUNATENESS FRACTIOUSNESS FRACTOSTRATUS FUSTILLIRIANS GASTEROPODOUS GASTROCNEMIUS GASTRULATIONS GESTICULATORS GRADUATESHIPS GROSSULARITES GUESSTIMATING HARMONIUMISTS HATEFULNESSES HAUGHTINESSES HEALTHFULNESS HETEROOUSIANS HETEROSEXUALS HOMOSEXUALIST HOUSEPAINTERS HUMANISATIONS HUNTSMANSHIPS HYDROSOMATOUS HYPOSULPHATES HYSTERANTHOUS ICHTHYOSAURUS ILLUSTRATIONS IMMUNISATIONS IMMUTABLENESS IMPOSTHUMATES IMPUTABLENESS INCRUSTATIONS INCUNABULISTS INDUSTRIALISE INDUSTRIALISM INDUSTRIALIST INOSCULATIONS INSALUBRITIES INSTANTANEOUS INSTAURATIONS INSTRUMENTALS INSUBSTANTIAL INSUFFLATIONS INTERRADIUSES ISOSTHENURIAS ITHYPHALLUSES JUSTICIALISMS JUSTICIARSHIP JUSTIFICATORS KATHAREVOUSAS LANGUISHMENTS LAUREATESHIPS LAURUSTINUSES LEUCOPLASTIDS LUCRATIVENESS MAGISTRATURES MAGNETOPAUSES MANSLAUGHTERS MASCULINITIES MASTERFULNESS MASTURBATIONS MENSTRUATIONS MERCURIALISTS METALLURGISTS MISADJUSTMENT MISADVENTURES MISASSUMPTION MISATTRIBUTES MISCALCULATES MISCATALOGUES MISEDUCATIONS MISPUNCTUATES MISQUOTATIONS MISSUMMATIONS MISUNDERSTAND MITRAILLEUSES MOUNTAINSIDES MOUSQUETAIRES MULTIACCESSES MULTICAMPUSES MULTITASKINGS MUNICIPALISTS MUSCULARITIES MUSICIANLIEST MUTABLENESSES MUTESSARIFATS NATRIURESISES NATURALNESSES NAUGHTINESSES NEBULISATIONS NEMATODIRUSES NEURASTHENIAS NEURASTHENICS NEUROPATHISTS NEUTRALNESSES NOCTAMBULISMS NOCTAMBULISTS NUCLEOTIDASES OBSCURANTISMS OBSCURANTISTS OSTREOPHAGOUS OUTPASSIONING OUTWARDNESSES OVERSATURATES PANSEXUALISTS PENTASTICHOUS PERIOSTRACUMS PERPETUALISMS PERPETUALISTS PHOSPHATURIAS PIQUANTNESSES PLAGIOSTOMOUS PNEUMATOLYSES PNEUMATOLYSIS POSTDILUVIANS POSTGRADUATES POSTHOLOCAUST POSTMENOPAUSE POSTMENSTRUAL POSTULANTSHIP PREGUSTATIONS PREMATURENESS PROCONSULATES PSEUDOMARTYRS PTEROSAURIANS PULSATILITIES PYROSULPHATES QUAESTORSHIPS QUANTISATIONS QUARRYMASTERS QUARTERSTAFFS QUARTERSTAVES QUASICRYSTALS QUESTIONARIES RABBITBRUSHES RAPTUROUSNESS READJUSTMENTS REASSUMPTIONS RESTAURATEURS RESTAURATIONS RESUPINATIONS RESUSCITATING RESUSCITATION RESUSCITATIVE RESUSCITATORS RETRANSFUSING REUSABILITIES RURALISATIONS SALUTATORIANS SANCTIMONIOUS SANCTUARISING SANSCULOTTISH SANSCULOTTISM SANSCULOTTIST SARMENTACEOUS SATURNINITIES SAUROGNATHOUS SCATHEFULNESS SCHIZANTHUSES SCRATCHBUILDS SCRIPTURALISM SCRIPTURALIST SCUTELLATIONS SECRETAGOGUES SEMIMENSTRUAL SEPTUPLICATES SEQUESTRATING SEQUESTRATION SEQUESTRATORS SESQUIALTERAS SESQUIPLICATE SESQUITERTIAS SEXTUPLICATES SEXUALISATION SHAMATEURISMS SINGULARITIES SITUATIONISMS SLUGGARDLIEST SLUMPFLATIONS SOMATOPLEURES SOMERSAULTING SOMNAMBULANTS SOMNAMBULATES SOMNAMBULISTS SOUSAPHONISTS SOUTHEASTERLY SOUTHEASTWARD SOUTHWESTWARD SPECULARITIES SPECULATRICES SPECULATRIXES SPIRITUALISED SPIRITUALISER SPIRITUALISES SPIRITUALISMS SPIRITUALISTS SPIRITUALIZES SPIRITUALNESS SPIRITUALTIES SPLATTERPUNKS SPONTANEOUSLY SQUATTINESSES STAGGERBUSHES STALACTITIOUS STAMINIFEROUS STAUNCHNESSES STEGANOPODOUS STEGOSAURIANS STEGOSAURUSES STENOPETALOUS STEPDAUGHTERS STERCORACEOUS STERCORARIOUS STERNUTATIONS STERNUTATIVES STRATOCUMULUS STREPTOCARPUS STRIDULATIONS STROBILACEOUS STRUCTURALISE STRUCTURALISM STRUCTURALIST STUDDINGSAILS STUPEFACIENTS STUPEFACTIONS SUBADOLESCENT SUBAGGREGATES SUBALTERNANTS SUBALTERNATES SUBARCUATIONS SUBARRHATIONS SUBCATEGORIES SUBCATEGORISE SUBCELESTIALS SUBCONTRARIES SUBDEACONATES SUBDEBUTANTES SUBDIACONATES SUBERISATIONS SUBERIZATIONS SUBFACTORIALS SUBFEUDATIONS SUBHASTATIONS SUBINFEUDATES SUBLINEATIONS SUBLITERACIES SUBMINIATURES SUBORDINATORS SUBSATELLITES SUBSATURATION SUBSEQUENTIAL SUBSIDIARIATS SUBSIDISATION SUBSIDIZATION SUBSISTENTIAL SUBSPECIALIST SUBSPECIALITY SUBSTANCELESS SUBSTANTIALLY SUBSTANTIATED SUBSTANTIATES SUBSTANTIATOR SUBSTANTIVELY SUBSTANTIVISE SUBSTANTIVITY SUBSTANTIVIZE SUBSTITUTABLE SUBSTRACTIONS SUBSTRUCTURAL SUBTERRANEANS SUBTERRANEOUS SUBTILISATION SUBTREASURERS SUBTREASURIES SUBURBANITIES SUCCUSSATIONS SUFFRAGETTISM SUITABILITIES SULFURISATION SULPHONATIONS SULPHURATIONS SUMMABILITIES SUMMARISATION SUMMERSAULTED SUPERANNUATES SUPERATHLETES SUPERCABINETS SUPERCAUTIOUS SUPERELEVATES SUPEREROGATES SUPERFRONTALS SUPERLOYALIST SUPERNATURALS SUPEROVULATES SUPERPATRIOTS SUPERPLASTICS SUPERREALISTS SUPERSAFETIES SUPERSATURATE SUPERSTARDOMS SUPERSTATIONS SUPERSTRATUMS SUPERTEACHERS SUPPLEMENTALS SUPPLICATIONS SUPPOSITIONAL SURROGATESHIP SUSPERCOLLATE SUSTENTACULAR SUSTENTACULUM SUSTENTATIONS TACTFULNESSES TAMBOURINISTS TEARFULNESSES TELEOSAURIANS TENACIOUSNESS TETRASTICHOUS THERAPEUTISTS THIOSULPHATES THOUSANDFOLDS TOUCHABLENESS TRADUCIANISMS TRADUCIANISTS TRANQUILISERS TRANQUILLISES TRANSDUCTANTS TRANSDUCTIONS TRANSEXUALISM TRANSFUSIONAL TRANSFUSIVELY TRANSHUMANCES TRANSLUCENCES TRANSUDATIONS TRANSUMPTIONS TRANSVALUATES TREASURERSHIP TRIBUTARINESS TRIUMPHALISMS TRIUMPHALISTS TRUSTAFARIANS TSUTSUGAMUSHI TUNABLENESSES TYRANNOSAURUS TYRANNOUSNESS ULTRALEFTISMS ULTRALEFTISTS ULTRAREALISMS ULTRAREALISTS UNASSERTIVELY UNASSIMILATED UNCERTAINNESS UNCHASTISABLE UNCONSECRATES UNCONSTRAINTS UNCREATEDNESS UNDAUNTEDNESS UNDERSTANDERS UNDERSTRATUMS UNDISSOCIATED UNEARTHLINESS UNEATABLENESS UNESSENTIALLY UNESTABLISHED UNHEALTHINESS UNIONISATIONS UNITARIANISMS UNIVERSALISTS UNNATURALISES UNNATURALNESS UNPARASITISED UNPASTEURISED UNPLASTICISED UNSAINTLINESS UNSATISFIABLE UNSATURATIONS UNSENSATIONAL UNSOCIALITIES UNSTAIDNESSES UNSTEADFASTLY UNSTIGMATISED UNSUBSTANTIAL UNSUSTAINABLE UNSUSTAINABLY UNTACTFULNESS UNTAINTEDNESS UNTAMABLENESS UNTAMEDNESSES UNTENABLENESS UNTRESPASSING UNTUNABLENESS URANOPLASTIES URBANISATIONS URBANOLOGISTS USTILAGINEOUS UTTERABLENESS VANQUISHMENTS VASCULARITIES VAUDEVILLISTS VESICULATIONS VEXATIOUSNESS VISUALISATION VOLUNTARINESS VOLUNTARYISMS VOLUNTARYISTS WASTERFULNESS WATERTHRUSHES WHATABOUTISMS