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