There are 413 fourteen-letter words containing 2A, S, T and U, https://www.bestwordlist.com/c/a/5/14letterwordswithaastu.htm ABSQUATULATING ACCENTUALITIES ACCOUNTANTSHIP ACCULTURATIONS ACCURATENESSES ACCUSTOMATIONS ACTINOBACILLUS ACTINOURANIUMS ACTUALISATIONS ACTUALIZATIONS ADEQUATENESSES ADIATHERMANOUS ADMEASUREMENTS ADVANTAGEOUSLY AERENCHYMATOUS AGGLUTINATIONS AGROINDUSTRIAL ALTRUISTICALLY AMARANTHACEOUS AMATEURISHNESS AMPHIBLASTULAE ANARTHROUSNESS ANGIOSTOMATOUS ANGUSTIFOLIATE ANISODACTYLOUS ANNUITISATIONS ANNUITIZATIONS ANTEPENULTIMAS ANTHRAQUINONES ANTHROPOPHAGUS ANTIBARBARUSES ANTICOAGULANTS ANTICONVULSANT ANTIGUERRILLAS ANTIHOMOSEXUAL ANTIHUMANISTIC ANTINUCLEARIST ANTIQUARIANISM ANTIQUATEDNESS ANTIQUITARIANS ANTIRHEUMATICS ANTIRITUALISMS ANTISCRIPTURAL ANTONINIANUSES APPROPINQUATES AQUACULTURISTS ARGUMENTATIONS ARMAMENTARIUMS ARTICULATENESS ARTIODACTYLOUS ASSAULTIVENESS ASSUMABILITIES AUDIOCASSETTES AUDITABILITIES AUTHENTICATORS AUTHORISATIONS AUTHORITARIANS AUTHORIZATIONS AUTOALLOGAMIES AUTOANTIBODIES AUTOCATALYSING AUTOIONISATION AUTOMATICITIES AUTOMATISATION AUTORADIOGRAMS AUTOSCHEDIASMS AUTOSCHEDIAZED AUTOSCHEDIAZES AVASCULARITIES AVERRUNCATIONS AVUNCULARITIES BACCALAUREATES BIOACCUMULATES BIOACOUSTICIAN BIOAERONAUTICS BRUTALISATIONS BRUTALIZATIONS BUREAUCRATESES BUREAUCRATISED BUREAUCRATISES BUREAUCRATISMS BUREAUCRATISTS BUREAUCRATIZES CALAMITOUSNESS CALCULATEDNESS CANTANKEROUSLY CARBURISATIONS CARBURIZATIONS CASUALISATIONS CASUALIZATIONS CATECHUMENATES CAUTERISATIONS CAUTERIZATIONS CHATEAUBRIANDS CIRCUMSTANTIAL CIRCUMVALLATES CLAUSTROPHILIA CLAUSTROPHOBIA COASTGUARDSMAN COASTGUARDSMEN COMMUNAUTAIRES COMMUNITARIANS CONFABULATIONS CONGRATULATORS CONNATURALISED CONNATURALISES CONNATURALIZES CONNATURALNESS CONSTABULARIES CONSUBSTANTIAL COUNTERASSAULT COUNTERATTACKS CYCLANTHACEOUS DAUGHTERBOARDS DEAMBULATORIES DECAPSULATIONS DECARBURATIONS DEGRANULATIONS DEHUMANISATION DENATURALISING DESQUAMATORIES DIAMANTIFEROUS DISAMBIGUATING DISAMBIGUATION DISARTICULATED DISARTICULATES DISARTICULATOR DISNATURALISED DISNATURALISES DISNATURALIZED DISNATURALIZES DOCUMENTARIANS EDUCATIONALIST ENCAPSULATIONS ENTHUSIASTICAL EQUATABILITIES EXCLAUSTRATION EXSANGUINATING EXSANGUINATION EXTRAFORANEOUS FASCICULATIONS FATIGUABLENESS FEUDALISATIONS FEUDALIZATIONS FLUNITRAZEPAMS FLUOROACETATES FRUITARIANISMS FUNAMBULATIONS FUNDAMENTALISM FUNDAMENTALIST GALACTOPHOROUS GASTRODUODENAL GASTROVASCULAR GRANDDAUGHTERS GRATICULATIONS HABITUALNESSES HAEMATOPHAGOUS HALLUCINATIONS HARUSPICATIONS HUMANISTICALLY ICHTHYOSAURIAN ILLUSTRATIONAL IMMACULATENESS IMMUNOASSAYIST INACCURATENESS INADEQUATENESS INARTICULACIES INCAPSULATIONS INTERJACULATES INTRACUTANEOUS INTRANSMUTABLE JOURNALISATION MACRODACTYLOUS MACROMUTATIONS MALACOSTRACOUS MALADJUSTMENTS MANUFACTURINGS MATRICULATIONS MELASTOMACEOUS MISARTICULATED MISARTICULATES MISCALCULATING MISCALCULATION MISCALCULATORS MISCATALOGUING MISEVALUATIONS MONOUNSATURATE MOUNTAINBOARDS MULLIGATAWNIES MULTIMEGAWATTS MULTINATIONALS MULTIRACIALISM MUSICALISATION MUSICALIZATION MUTUALISATIONS MUTUALIZATIONS NATURALISATION NEURASTHENIACS NEUROANATOMIES NEUROANATOMIST NEUROBLASTOMAS NEUTRALISATION NONSPECTACULAR NUCLEARISATION NUMISMATICALLY NUTRACEUTICALS NYCTAGINACEOUS OUTMANIPULATES OVERSATURATING OVERSATURATION OVERVALUATIONS PACHYDACTYLOUS PACHYDERMATOUS PALAEOCURRENTS PANDICULATIONS PANSEXUALITIES PARALINGUISTIC PARAMENSTRUUMS PARANTHROPUSES PARENCHYMATOUS PARTICULARISED PARTICULARISER PARTICULARISES PARTICULARISMS PARTICULARISTS PARTICULARIZES PARTICULARNESS PASTEURISATION PASTEURIZATION PAUPERISATIONS PAUPERIZATIONS PENNATULACEOUS PENTADACTYLOUS PERAMBULATIONS PERSUADABILITY PHARMACEUTISTS PHONAUTOGRAPHS PLATYCEPHALOUS PLEASURABILITY PLURALISATIONS PLURALIZATIONS POLYUNSATURATE POPULARISATION PORTULACACEOUS POSTAMPUTATION POSTGRADUATION POSTMENOPAUSAL PROTOLANGUAGES PSEUDAESTHESIA PURCHASABILITY QUADRILATERALS QUADRILITERALS QUADRUMVIRATES QUADRUPLICATES QUAESTIONARIES QUALIFICATIONS QUALIFICATIVES QUANTIVALENCES QUARTERMASTERS QUARTODECIMANS QUASIPARTICLES RECALCULATIONS REGULARISATION REMANUFACTURES RESTAURANTEURS RITUALISATIONS RITUALIZATIONS SALUTARINESSES SANGUIFICATION SATURABILITIES SAUROPTERYGIAN SECULARISATION SECULARIZATION SEMIAUTOMATICS SENSUALISATION SENSUALIZATION SEPTUAGENARIAN SEPTUAGENARIES SEXUALISATIONS SEXUALIZATIONS SLANTENDICULAR SLANTINDICULAR SOLITUDINARIAN SOMNAMBULATING SOMNAMBULATION SOMNAMBULATORS SOUTHEASTWARDS SPECTACULARITY SQUATTOCRACIES STRANGULATIONS STRATICULATION SUBAGGREGATION SUBALLOCATIONS SUBALTERNATION SUBASSOCIATION SUBPROLETARIAT SUBSATURATIONS SUBSTANTIALISE SUBSTANTIALISM SUBSTANTIALIST SUBSTANTIALITY SUBSTANTIALIZE SUBSTANTIATING SUBSTANTIATION SUBSTANTIATIVE SUBSTANTIATORS SUBSTANTIVALLY SUBTERRANEANLY SULFACETAMIDES SULFAMETHAZINE SULFATHIAZOLES SULPHACETAMIDE SULPHATHIAZOLE SUMMARISATIONS SUMMARIZATIONS SUOVETAURILIAS SUPERANNUATING SUPERANNUATION SUPERNATATIONS SUPERNATURALLY SUPERSATURATED SUPERSATURATES SUPERTERRANEAN SUPPLANTATIONS SUPRASEGMENTAL SUSTAINABILITY TABULARISATION TETRADACTYLOUS THAUMATOGENIES THAUMATOLOGIES THAUMATURGISMS THAUMATURGISTS THAUMATURGUSES THYMELAEACEOUS TRADUCIANISTIC TRANSCAUCASIAN TRANSCUTANEOUS TRANSDUCTIONAL TRANSEXUALISMS TRANSMUTATIONS TRANSSEXUALISM TRANSSEXUALITY TRANSVALUATING TRANSVALUATION TRAUMATISATION TRAUMATOLOGIES TRIANGULATIONS TURANGAWAEWAES TYRANNOSAURIDS ULTRAFILTRATES ULTRAGLAMOROUS ULTRAHAZARDOUS ULTRAMARATHONS ULTRAMASCULINE ULTRAMILITANTS ULTRAMONTANISM ULTRAMONTANIST ULTRAREALISTIC ULTRAROMANTICS ULTRAROYALISTS ULTRASONICALLY ULTRAWIDEBANDS UNACCLIMATISED UNAMIABILITIES UNAPPROPRIATES UNDERGRADUATES UNDERSATURATED UNDERSTANDABLE UNDERSTANDABLY UNICAMERALISTS UNILATERALISMS UNILATERALISTS UNINHABITABLES UNIVERSITARIAN UNMATERIALISED UNMETAPHYSICAL UNNATURALISING UNPLEASANTNESS UNPLEASANTRIES UNRESTRAINABLE UNSALABILITIES UNSATISFACTION UNSATISFACTORY UNSECTARIANISM UNSTANDARDISED UNSTANDARDIZED UNSYSTEMATICAL UNTAMEABLENESS UNTRANSFERABLE UNTRANSLATABLE UNTRANSLATABLY UNTRANSMUTABLE URALITISATIONS URALITIZATIONS URANOGRAPHISTS URBANISTICALLY UTILITARIANISE UTILITARIANISM VACUOLISATIONS VACUOLIZATIONS VALETUDINARIES VERNACULARISTS VILLEGGIATURAS VIRTUALISATION VISUALISATIONS VISUALIZATIONS VULCANISATIONS VULCANIZATIONS VULGARISATIONS VULGARIZATIONS WELTANSCHAUUNG WHATABOUTERIES XANTHOMELANOUS