There are 770 twelve-letter words containing A, 2C and T, https://www.bestwordlist.com/c/a/4/12letterwordswithacct.htm ACANTHACEOUS ACATALECTICS ACATALEPTICS ACCELERATING ACCELERATION ACCELERATIVE ACCELERATORS ACCELERATORY ACCENTUALITY ACCENTUATING ACCENTUATION ACCEPTANCIES ACCEPTATIONS ACCIACCATURA ACCIACCATURE ACCIDENTALLY ACCIPITRINES ACCLAMATIONS ACCLIMATABLE ACCLIMATIONS ACCLIMATISED ACCLIMATISER ACCLIMATISES ACCLIMATIZED ACCLIMATIZER ACCLIMATIZES ACCOMMODATED ACCOMMODATES ACCOMMODATOR ACCOMPANISTS ACCOMPANYIST ACCORDIONIST ACCOUCHEMENT ACCOUPLEMENT ACCOUTERMENT ACCOUTREMENT ACCREDITABLE ACCRETIONARY ACCULTURATED ACCULTURATES ACCUMULATING ACCUMULATION ACCUMULATIVE ACCUMULATORS ACCURATENESS ACCUSATIVELY ACCUSATORIAL ACCUSTREMENT ACOUSTICALLY ACOUSTICIANS ACQUAINTANCE ACQUIESCENTS ACQUITTANCED ACQUITTANCES ACROAMATICAL ACROCENTRICS ACROPHONETIC ACROSTICALLY ACTINOMETRIC ACTINOMYCETE ACTINOMYCINS ACUPUNCTURAL ACUPUNCTURES ALCOHOLICITY AMPHICTYONIC ANACATHARTIC ANACREONTICS ANAPHYLACTIC ANAPTYCTICAL ANCHORETICAL ANCHORITICAL ANDROCENTRIC ANTECEDENCES ANTIACADEMIC ANTIBACCHIUS ANTICATHOLIC ANTICHOICERS ANTICLERICAL ANTICYCLONES ANTICYCLONIC ANTIECONOMIC ANTIKICKBACK ANTIRACHITIC ANTISCIENCES APOCHROMATIC APODEICTICAL APOPLECTICAL AQUACEUTICAL ARCHETYPICAL ARCHITECTING ARCHITECTURE ARISTOCRATIC ARTHROSCOPIC ARTICULACIES ASCOMYCETOUS ATTRACTANCES AUTOCEPHALIC AUTOCHTHONIC AUTOCORRECTS AUTOCRATICAL AUTODIDACTIC BACKCHATTING BACKCOURTMAN BACKCOURTMEN BACKSCATTERS BACKSTITCHED BACKSTITCHES BACKTRACKING BACTERICIDAL BACTERICIDES BACTERIOCIDE BACTERIOCINS BATHOCHROMIC BESPECTACLED BIOACOUSTICS BIOCATALYTIC BIOTECHNICAL BLACKCURRANT BLASTOCOELIC BRACHYDACTYL BRECCIATIONS BUREAUCRATIC CABALISTICAL CABLECASTING CACHINNATING CACHINNATION CACHINNATORY CACOTROPHIES CACTOBLASTES CACTOBLASTIS CAENOGENETIC CAINOGENETIC CALCEAMENTUM CALCINATIONS CALCIPOTRIOL CALCULATEDLY CALCULATIONS CALEFACIENTS CALEFACTIONS CALISTHENICS CALLISTHENIC CALORICITIES CALORIMETRIC CALYCANTHEMY CANALICULATE CANCELATIONS CANCELLATION CANCERATIONS CANDESCENTLY CANDLESTICKS CANONICITIES CAPACITANCES CAPACITATING CAPACITATION CAPACITIVELY CAPITALISTIC CAPROLACTAMS CAPTIVAUNCES CARDIOTONICS CARICATURING CARICATURIST CARRIWITCHET CARTOGRAPHIC CARTOLOGICAL CARTOMANCIES CARUNCULATED CATACAUSTICS CATACHRESTIC CATACOUSTICS CATADIOPTRIC CATALLACTICS CATAPHORETIC CATAPHRACTIC CATAPHYSICAL CATASTROPHIC CATCHINESSES CATCHPENNIES CATCHPHRASES CATECHESISES CATECHETICAL CATECHISINGS CATECHIZINGS CATECHUMENAL CATHODICALLY CATHOLICALLY CATHOLICATES CATHOLICISED CATHOLICISES CATHOLICISMS CATHOLICIZED CATHOLICIZES CATHOLICOSES CATIONICALLY CAUSTICITIES CENTRALISTIC CENTROCLINAL CENTUPLICATE CEROPLASTICS CERTIFICATED CERTIFICATES CHALCANTHITE CHALCOLITHIC CHALCOPYRITE CHALICOTHERE CHANTICLEERS CHARACTERFUL CHARACTERIES CHARACTERING CHARACTERISE CHARACTERISM CHARACTERIZE CHARCOALIEST CHARCUTERIES CHARISMATICS CHATOYANCIES CHAUVINISTIC CHELICERATES CHIROPRACTIC CHIROPRACTOR CHITCHATTING CHLOROACETIC CHOCOLATIERS CHOCOLATIEST CHREMATISTIC CHROMATICISM CHROMATICITY CHURCHIANITY CICATRICHULE CICATRICULAS CIRCULATABLE CIRCULATINGS CIRCULATIONS CIRCUMGYRATE CIRCUMJACENT CIRCUMNUTATE CIRCUMROTATE CIRCUMSTANCE CITIFICATION CITYFICATION CLADOGENETIC CLASSICALIST CLASSICALITY CLASSICISTIC CLAUDICATION CLAVECINISTS CLAVIERISTIC CLEARCUTTING CLEISTOGAMIC CLEPTOMANIAC CLERICALISTS CLICKSTREAMS CLIMACTERICS CLIMATICALLY CLIMATOLOGIC CLIOMETRICAL COACERVATING COACERVATION COACTIVITIES COADJUTRICES COARCTATIONS COCAPTAINING COCCIDIOSTAT COCKAMAMIEST COCULTIVATED COCULTIVATES CODIFICATION COEDUCATIONS COELACANTHIC COENOBITICAL COINCIDENTAL COLLECTABLES COLLECTORATE COLLOCATIONS COLLUCTATION COLORCASTING COLOURCASTED COMICALITIES COMMUNICANTS COMMUNICATED COMMUNICATEE COMMUNICATES COMMUNICATOR COMPACTIFIED COMPACTIFIES COMPATRIOTIC COMPLACENTLY COMPLICATING COMPLICATION COMPLICATIVE COMPORTANCES CONCATENATED CONCATENATES CONCEALMENTS CONCELEBRANT CONCELEBRATE CONCENTRATED CONCENTRATES CONCENTRATOR CONCENTRICAL CONCEPTACLES CONCEPTIONAL CONCEPTUALLY CONCERTANTES CONCERTINAED CONCILIATING CONCILIATION CONCILIATIVE CONCILIATORS CONCILIATORY CONCLAMATION CONCOMITANCE CONCOMITANCY CONCOMITANTS CONCORDANTLY CONCORPORATE CONCREMATION CONCUBITANCY CONCUBITANTS CONDUCTANCES CONDUCTIONAL CONDUCTORIAL CONDUPLICATE CONFISCATING CONFISCATION CONFISCATORS CONFISCATORY CONJUNCTIVAE CONJUNCTIVAL CONJUNCTIVAS CONJUNCTURAL CONNECTIONAL CONSECRATING CONSECRATION CONSECRATIVE CONSECRATORS CONSECRATORY CONSECTARIES CONSOCIATING CONSOCIATION CONSPIRACIST CONTABESCENT CONTACTUALLY CONTINUANCES CONTRACTABLE CONTRACTABLY CONTRACTEDLY CONTRACTIBLE CONTRACTIBLY CONTRACTIONS CONTRACTURAL CONTRACTURES CONTRADANCES CONTRADICTED CONTRADICTER CONTRADICTOR CONTRAOCTAVE CONTREDANCES CONTRIVANCES CONTUMACIOUS CONVALESCENT CONVECTIONAL CONVICTIONAL CONVOCATIONS CORNSTARCHES CORRECTIONAL CORTICATIONS CORUSCATIONS COSCENARISTS COSMETICALLY COSMETICIANS COSMONAUTICS COSMOPLASTIC COSURFACTANT COTRANSDUCED COTRANSDUCES COTTONOCRACY COUNTENANCED COUNTENANCER COUNTENANCES COUNTERACTED COUNTERBRACE COUNTERCHARM COUNTERCLAIM COUNTERMARCH COUNTERPACES COUNTERSCARP CRANIOMETRIC CRESCENTADES CRETACEOUSES CRETACEOUSLY CRITICALNESS CRITICASTERS CRITICISABLE CRITICIZABLE CROSSHATCHED CROSSHATCHES CROSSMATCHED CROSSMATCHES CROSSPATCHES CRYPTOCOCCAL CRYSTALLITIC CUBISTICALLY CURVICAUDATE CURVICOSTATE CYANOGENETIC CYBERATTACKS CYBERNETICAL CYCADOPHYTES CYCLANDELATE CYCLISATIONS CYCLIZATIONS CYCLOPAEDIST CYCLOPENTANE CYCLOSTOMATE CYCLOTHYMIAC CYCLOTHYMIAS CYTOCHALASIN CYTOCHEMICAL CZAREVITCHES DACTYLICALLY DACTYLOSCOPY DECONSECRATE DECORTICATED DECORTICATES DECORTICATOR DEFLOCCULANT DEFLOCCULATE DEMOCRATICAL DESICCATIONS DESICCATIVES DESPOTOCRACY DIALECTICIAN DIALECTICISM DICHOTICALLY DICHROMATICS DIDACTICALLY DIDACTICISMS DISACCORDANT DISACCREDITS DISACCUSTOMS DISCALCEATES ECCLESIASTIC ECHOLOCATING ECHOLOCATION ECLECTICALLY ECLIPTICALLY ECOTYPICALLY ECSTATICALLY EFFICACITIES EGOCENTRICAL ELECTRICALLY ELECTRICIANS ELECTROCLASH ELECTRONICAS ENCEPHALITIC ENCLITICALLY ENCROACHMENT ENDOCARDITIC ENTEROCOCCAL EPICUTICULAR EPIDEICTICAL ESCHATOLOGIC EXCORTICATED EXCORTICATES EXCRUCIATING EXCRUCIATION EXECUTANCIES EXORCISTICAL EXPECTANCIES EXSICCATIONS FACTUALISTIC FASCICULATED FLACCIDITIES FLOCCULATING FLOCCULATION FLOCCULATORS FRACTOCUMULI GALACTOSEMIC GASTROSCOPIC GEOCENTRICAL GEOTECHNICAL GERONTOCRACY GNATCATCHERS GRANULOCYTIC GYNECOCRATIC HECTOGRAPHIC HETEROCERCAL HETEROTACTIC HEXADACTYLIC HYGROCHASTIC HYPOCRITICAL ICHTHYOCOLLA ICONOCLASTIC ICONOMACHIST INACCURATELY INARTICULACY INCANDESCENT INCAPACITANT INCAPACITATE INCAPACITIES INCARCERATED INCARCERATES INCARCERATOR INCULCATIONS INDOLEACETIC INEFFICACITY INEXPECTANCY INOCCUPATION INSECTICIDAL INTERJACENCY INTEROCEANIC INTERVOCALIC INTRACARDIAC INTRAPSYCHIC ISOCHROMATIC KAKISTOCRACY KLEPTOCRATIC LACTESCENCES LACTOBACILLI LYCANTHROPIC MACHICOLATED MACHICOLATES MACROBIOTICS MACROCLIMATE MACROCYTOSES MACROCYTOSIS MACRODACTYLS MACRODACTYLY MALPRACTICES MARCASITICAL MECHATRONICS MERITOCRATIC MESOTHORACIC METACENTRICS METACERCARIA METAGALACTIC METAPSYCHICS METATHORACIC MICROCLIMATE MICROCRYSTAL MICROPLASTIC MICROTOMICAL MISCALCULATE MISCHANCIEST MOBOCRATICAL MOLECATCHERS MONARCHISTIC MOTORCOACHES MYCOBACTERIA NARCISSISTIC NARCOLEPTICS NARCOTICALLY NECTOCALYCES NEMATOCYSTIC NONARCHITECT NONCHARACTER NONCONTRACTS NONPRACTICAL NONTECHNICAL OCCIDENTALLY OCCULTATIONS OCCUPATIONAL OCTASTICHONS OCTASTICHOUS OCTASTROPHIC OCTOSYLLABIC OCTUPLICATES OLFACTRONICS OPHICALCITES OPTOACOUSTIC ORGANICISTIC ORTHOCLASTIC OSTEOCLASTIC OSTEOMALACIC OVERCAPACITY OVERCATCHING OVERCRITICAL PACIFICATING PACIFICATION PACIFICATORS PACIFICATORY PANCHROMATIC PANTECHNICON PANTISOCRACY PARACROSTICS PARATACTICAL PAROCCIPITAL PECTINACEOUS PEDANTOCRACY PENTARCHICAL PERICARDITIC PERSPICACITY PHAGOCYTICAL PHAGOCYTOTIC PHALLOCRATIC PHARMACEUTIC PHONOCAMPTIC PHONOTACTICS PHOTOACTINIC PHYLLOTACTIC PHYSIOCRATIC PICTOGRAPHIC PICTORICALLY PINACOTHECAE PLUTOCRACIES POCOCURANTES POSTACCIDENT POSTVACCINAL PRACTICALISM PRACTICALIST PRACTICALITY PRECIPITANCE PRECIPITANCY PRECONTRACTS PREECLAMPTIC PREOCCUPANTS PREOCCUPATED PREOCCUPATES PROPHYLACTIC PROSTACYCLIN PSYCHOACTIVE PSYCHOPATHIC PUNDITOCRACY PYROCATECHIN PYROCATECHOL PYROCLASTICS RACETRACKERS RADICALISTIC REACCELERATE REACCEPTANCE REACCLIMATED REACCLIMATES REACCREDITED REACCUSTOMED RECALCITRANT RECALCITRATE RECALCULATED RECALCULATES RECEPTACULAR RECEPTACULUM RECIPROCANTS RECIPROCATED RECIPROCATES RECIPROCATOR RECIRCULATED RECIRCULATES RECOMPACTING RECONSECRATE RECONTACTING REFLECTANCES RELUCTANCIES REOCCUPATION REVACCINATED REVACCINATES SACCHARINITY SACCULATIONS SACROCOSTALS SALTCHUCKERS SALTIMBOCCAS SANSCULOTTIC SCARIFICATOR SCATOLOGICAL SCATTERMOUCH SCHECKLATONS SCHISMATICAL SCHOLASTICAL SCHOOLCRAFTS SCIENTIFICAL SCRATCHBACKS SCRATCHBOARD SCRATCHBUILD SCRATCHBUILT SCRATCHCARDS SCRATCHINESS SCRATCHINGLY SCRATCHPLATE SCREENCRAFTS SCROBICULATE SECRETAGOGIC SECULARISTIC SOLECISTICAL SPATCHCOCKED SPECIALISTIC SPECIFICATED SPECIFICATES SPECTACULARS SPECTATRICES SPECULATRICE SPEECHCRAFTS SQUATTOCRACY STAGECOACHES STAUROSCOPIC STEREOTACTIC STICKLEBACKS STITCHCRAFTS STOMACHACHES STRATOCRATIC STYRACACEOUS SUBANTARCTIC SUBCLIMACTIC SUBCONTRACTS SUBOCCIPITAL SUCCESSANTLY SUCCINCTORIA SUCCUSSATION SUSCEPTANCES SWITCHBACKED SYNDIOTACTIC SYNECTICALLY SYNTACTICIAN TACHEOMETRIC TACHYCARDIAC TACHYCARDIAS TACHYGRAPHIC TECHNICALISE TECHNICALITY TECHNICALIZE TECHNOCRATIC TECHNOMANIAC TECTIBRANCHS TECTONICALLY TELESCOPICAL TETRACYCLINE TETRARCHICAL TETRASTICHIC THEOCRATICAL THERMOTACTIC THIGMOTACTIC THORACICALLY THORACOSCOPE TICKTACKTOES TIMOCRATICAL TOBACCONISTS TRACHEOSCOPY TRAGICOMICAL TRANSCALENCY TRANSLUCENCE TRANSLUCENCY TRANSOCEANIC TRANSPACIFIC TRENCHANCIES TRICHROMATIC TROCHAICALLY TROCHANTERIC TROPHOTACTIC ULTRACOMPACT UNACCEPTABLE UNACCEPTABLY UNACCEPTANCE UNACCLIMATED UNACCREDITED UNACCUSTOMED UNCALCULATED UNCATCHABLES UNCIRCULATED UNCOMPLACENT UNCONSECRATE UNCONTRACTED UNCRITICALLY UNDEMOCRATIC UNSPECTACLED UNVACCINATED VACCINATIONS VISCOELASTIC VOCICULTURAL WEATHERCOCKS XANTHOCHROIC ZOOTECHNICAL ZYGOCACTUSES ZYGODACTYLIC