There are 470 fourteen-letter words containing 2A, N, T and U, https://www.bestwordlist.com/c/a/5/14letterwordswithaantu.htm
ABSQUATULATING ACCENTUALITIES ACCOUNTABILITY ACCOUNTANTSHIP ACCULTURATIONS
ACCURATENESSES ACCUSTOMATIONS ACTINOBACILLUS ACTINOURANIUMS ACTUALISATIONS
ACTUALIZATIONS ADEQUATENESSES ADIATHERMANOUS ADMEASUREMENTS ADMINICULATING
ADVANTAGEOUSLY AERENCHYMATOUS AERONAUTICALLY AGGLUTINATIONS AGROINDUSTRIAL
ALTITUDINARIAN AMARANTHACEOUS AMATEURISHNESS ANARTHROUSNESS ANGIOSTOMATOUS
ANGUSTIFOLIATE ANISODACTYLOUS ANNUITISATIONS ANNUITIZATIONS ANTEDILUVIALLY
ANTEPENULTIMAS ANTHRAQUINONES ANTHROPOPHAGUS ANTIBARBARUSES ANTICOAGULANTS
ANTICONVULSANT ANTIGUERRILLAS ANTIHOMOSEXUAL ANTIHUMANISTIC ANTINUCLEARIST
ANTIQUARIANISM ANTIQUATEDNESS ANTIQUITARIANS ANTIREGULATORY ANTIREPUBLICAN
ANTIRHEUMATICS ANTIRITUALISMS ANTISCRIPTURAL ANTITUBERCULAR ANTONINIANUSES
APPROPINQUATED APPROPINQUATES ARGUMENTATIONS ARMAMENTARIUMS ARTICULATENESS
ASSAULTIVENESS ATTITUDINARIAN AUDIOMETRICIAN AUGMENTATIVELY AUTHENTICATING
AUTHENTICATION AUTHENTICATORS AUTHORISATIONS AUTHORITARIANS AUTHORIZATIONS
AUTOANTIBODIES AUTOCATALYSING AUTOCATALYZING AUTOIONISATION AUTOIONIZATION
AUTOMATISATION AUTOMATIZATION AVERRUNCATIONS AVUNCULARITIES BEAUTIFICATION
BIOACOUSTICIAN BIOAERONAUTICS BRUTALISATIONS BRUTALIZATIONS CALAMITOUSNESS
CALCULATEDNESS CANTANKEROUSLY CARBURISATIONS CARBURIZATIONS CASUALISATIONS
CASUALIZATIONS CATECHUMENATES CATECHUMENICAL CAUTERISATIONS CAUTERIZATIONS
CHATEAUBRIANDS CIRCUMNAVIGATE CIRCUMSTANTIAL CLAIRAUDIENTLY COASTGUARDSMAN
COASTGUARDSMEN COMMUNAUTAIRES COMMUNITARIANS CONFABULATIONS CONGRATULATING
CONGRATULATION CONGRATULATIVE CONGRATULATORS CONGRATULATORY CONNATURALISED
CONNATURALISES CONNATURALIZED CONNATURALIZES CONNATURALNESS CONSTABULARIES
CONSUBSTANTIAL CONTRAPUNTALLY COUNTERASSAULT COUNTERATTACKS COUNTERBALANCE
COUNTERFACTUAL CYANOBACTERIUM CYCLANTHACEOUS DEARTICULATING DECAPSULATIONS
DECARBURATIONS DEGRANULATIONS DEHUMANISATION DEHUMANIZATION DENATURALISING
DENATURALIZING DIAMANTIFEROUS DISAMBIGUATING DISAMBIGUATION DISNATURALISED
DISNATURALISES DISNATURALIZED DISNATURALIZES DOCUMENTARIANS EDUCATIONALIST
ELEUTHEROMANIA ENCAPSULATIONS ENTHUSIASTICAL EQUIANGULARITY EXCLAUSTRATION
EXSANGUINATING EXSANGUINATION EXTRAFORANEOUS FASCICULATIONS FATIGUABLENESS
FEUDALISATIONS FEUDALIZATIONS FLUNITRAZEPAMS FOUNDATIONALLY FRUITARIANISMS
FUNAMBULATIONS FUNDAMENTALISM FUNDAMENTALIST FUNDAMENTALITY GASTRODUODENAL
GRANDDAUGHTERS GRATICULATIONS HABITUALNESSES HAEMAGGLUTININ HALLUCINATIONS
HARUSPICATIONS HEADQUARTERING HEMAGGLUTINATE HUMANISTICALLY ICHTHYOSAURIAN
ILLUMINATIONAL ILLUSTRATIONAL IMMACULATENESS IMMUNOASSAYIST INACCURATENESS
INADEQUATENESS INARTICULACIES INARTICULATELY INARTICULATION INCAPSULATIONS
INTERAMBULACRA INTERJACULATED INTERJACULATES INTRACUTANEOUS INTRAMEDULLARY
INTRAMERCURIAL INTRAMOLECULAR INTRANSMUTABLE JOURNALISATION JOURNALIZATION
LATITUDINARIAN MACROMUTATIONS MALADJUSTMENTS MANIPULABILITY MANIPULATIVELY
MANUFACTURABLE MANUFACTURINGS MATRICULATIONS MINICALCULATOR MISCALCULATING
MISCALCULATION MISCATALOGUING MISEVALUATIONS MONOUNSATURATE MOUNTAINBOARDS
MULLIGATAWNIES MULTICANDIDATE MULTINATIONALS MUSICALISATION MUSICALIZATION
MUTUALISATIONS MUTUALIZATIONS NATURALISATION NATURALIZATION NEURASTHENIACS
NEUROANATOMIES NEUROANATOMIST NEUROBLASTOMAS NEUROFIBROMATA NEUTRALISATION
NEUTRALIZATION NOCTAMBULATION NONACCOUNTABLE NONBARBITURATE NONCONTRACTUAL
NONEDUCATIONAL NONSPECTACULAR NONUTILITARIAN NUCLEARISATION NUCLEARIZATION
NUDIBRANCHIATE NUMISMATICALLY NUTRACEUTICALS NYCTAGINACEOUS OCCUPATIONALLY
OUTMANIPULATED OUTMANIPULATES OVERABUNDANTLY OVERACCENTUATE OVEREVALUATING
OVEREVALUATION OVERSATURATING OVERSATURATION OVERVALUATIONS PALAEOCURRENTS
PANDICULATIONS PANSEXUALITIES PARALINGUISTIC PARAMENSTRUUMS PARANTHROPUSES
PARENCHYMATOUS PARTICULARNESS PARTURIFACIENT PASTEURISATION PASTEURIZATION
PAUPERISATIONS PAUPERIZATIONS PENNATULACEOUS PENTADACTYLOUS PERAMBULATIONS
PERTURBATIONAL PHONAUTOGRAPHS PLURALISATIONS PLURALIZATIONS POLYUNSATURATE
POPULARISATION POPULARIZATION POSTAMPUTATION POSTGRADUATION POSTMENOPAUSAL
PREACQUAINTING PREDEVALUATION PREMANUFACTURE PROTOLANGUAGES QUADRIGEMINATE
QUAESTIONARIES QUALIFICATIONS QUANTIFICATION QUANTITATIVELY QUANTIVALENCES
QUARTERBACKING QUARTODECIMANS QUODLIBETARIAN REACQUAINTANCE REARTICULATING
REARTICULATION RECALCULATIONS RECAPITULATING RECAPITULATION RECTANGULARITY
REGULARISATION REGULARIZATION REHUMANIZATION REMANUFACTURED REMANUFACTURER
REMANUFACTURES RESTAURANTEURS RITUALISATIONS RITUALIZATIONS SALUTARINESSES
SANGUIFICATION SAUROPTERYGIAN SECULARISATION SECULARIZATION SENSUALISATION
SENSUALIZATION SEPTUAGENARIAN SEPTUAGENARIES SEXUALISATIONS SEXUALIZATIONS
SLANTENDICULAR SLANTINDICULAR SOLITUDINARIAN SOMNAMBULATING SOMNAMBULATION
SOMNAMBULATORS STRANGULATIONS STRATICULATION SUBAGGREGATION SUBALLOCATIONS
SUBALTERNATION SUBASSOCIATION SUBSATURATIONS SUBSTANTIALISE SUBSTANTIALISM
SUBSTANTIALIST SUBSTANTIALITY SUBSTANTIALIZE SUBSTANTIATING SUBSTANTIATION
SUBSTANTIATIVE SUBSTANTIATORS SUBSTANTIVALLY SUBTERRANEANLY SULFAMETHAZINE
SUMMARISATIONS SUMMARIZATIONS SUPERANNUATING SUPERANNUATION SUPERNATATIONS
SUPERNATURALLY SUPERTERRANEAN SUPPLANTATIONS SUPRASEGMENTAL SUSTAINABILITY
TABULARISATION TABULARIZATION TEXTUALIZATION THAUMATOGENIES TINTINNABULANT
TINTINNABULARY TINTINNABULATE TRADUCIANISTIC TRANSCAUCASIAN TRANSCUTANEOUS
TRANSDUCTIONAL TRANSEXUALISMS TRANSMUTATIONS TRANSSEXUALISM TRANSSEXUALITY
TRANSVALUATING TRANSVALUATION TRAUMATISATION TRAUMATIZATION TRIANGULATIONS
TURANGAWAEWAES TYRANNOSAURIDS ULTRAMARATHONS ULTRAMASCULINE ULTRAMILITANTS
ULTRAMINIATURE ULTRAMONTANISM ULTRAMONTANIST ULTRAROMANTICS ULTRASONICALLY
ULTRAWIDEBANDS UNACCLIMATISED UNACCLIMATIZED UNACCOMMODATED UNACCULTURATED
UNACQUAINTANCE UNADAPTABILITY UNAFFECTIONATE UNALTERABILITY UNAMBIVALENTLY
UNAMIABILITIES UNAPPRECIATION UNAPPRECIATIVE UNAPPROPRIATED UNAPPROPRIATES
UNARTIFICIALLY UNATHLETICALLY UNATTRACTIVELY UNATTRIBUTABLE UNATTRIBUTABLY
UNAVAILABILITY UNAVOIDABILITY UNBUREAUCRATIC UNCONTAMINATED UNCULTIVATABLE
UNDERGRADUATES UNDERSATURATED UNDERSTANDABLE UNDERSTANDABLY UNDERVALUATION
UNDIDACTICALLY UNDOGMATICALLY UNDRAMATICALLY UNEMPHATICALLY UNFLAMBOYANTLY
UNFLAPPABILITY UNFRACTIONATED UNICAMERALISTS UNIFORMITARIAN UNILATERALISMS
UNILATERALISTS UNINGRATIATING UNINHABITABLES UNIVERSITARIAN UNMAINTAINABLE
UNMALLEABILITY UNMANUFACTURED UNMATERIALISED UNMATERIALIZED UNMATHEMATICAL
UNMATRICULATED UNMERCHANTABLE UNMETAPHORICAL UNMETAPHYSICAL UNNATURALISING
UNNATURALIZING UNPALATABILITY UNPEDANTICALLY UNPLEASANTNESS UNPLEASANTRIES
UNPRACTICALITY UNQUANTIFIABLE UNQUANTIFIABLY UNRECAPTURABLE UNRESTRAINABLE
UNROMANTICALLY UNSALABILITIES UNSATISFACTION UNSATISFACTORY UNSECTARIANISM
UNSTANDARDISED UNSTANDARDIZED UNSYSTEMATICAL UNTAMEABLENESS UNTRANSFERABLE
UNTRANSLATABLE UNTRANSLATABLY UNTRANSMUTABLE URALITISATIONS URALITIZATIONS
URANOGRAPHISTS URBANISTICALLY UTILITARIANISE UTILITARIANISM UTILITARIANIZE
VACUOLISATIONS VACUOLIZATIONS VALETUDINARIAN VALETUDINARIES VERNACULARISTS
VIRTUALISATION VIRTUALIZATION VISUALISATIONS VISUALIZATIONS VULCANISATIONS
VULCANIZATIONS VULGARISATIONS VULGARIZATIONS WELTANSCHAUUNG XANTHOMELANOUS