There are 739 twelve-letter words containing A, D, O, S and T, https://www.bestwordlist.com/c/a/5/12letterwordswithadost.htm ABANDONMENTS ACCOMMODATES ACCORDIONIST ACHROMATISED ACIDULATIONS ADENECTOMIES ADENOPATHIES ADIAPHORISTS ADJOURNMENTS ADJUDICATORS ADMONISHMENT ADOLESCENTLY ADOPTIANISMS ADOPTIANISTS ADOPTIONISMS ADOPTIONISTS ADROITNESSES ADSCITITIOUS ADSCRIPTIONS ADULTERATORS ADULTEROUSLY ADUMBRATIONS ADVANTAGEOUS ADVENTITIOUS ADVERTORIALS AERODONETICS AEROSIDERITE AGGRADATIONS AGRIPRODUCTS AGROINDUSTRY ALDOLISATION ALDOPENTOSES ALDOSTERONES ALPROSTADILS ALTITUDINOUS AMBIDEXTROUS AMONTILLADOS ANDROLOGISTS ANDROSTERONE ANECDOTALISM ANECDOTALIST ANISODACTYLS ANODISATIONS ANODIZATIONS ANTHEROZOIDS ANTHOLOGISED ANTICATHODES ANTIOXIDANTS APODYTERIUMS APOTHEOSISED APOTHEOSIZED ARFVEDSONITE ARTHROPODOUS ARTIODACTYLS ASSAFOETIDAS ASSORTEDNESS ASTEROIDEANS ASTOUNDINGLY ASTOUNDMENTS ASTRONOMISED ASTRONOMIZED ATTORNEYDOMS AUDIOLOGISTS AUDIOMETRIES AUDIOMETRIST AUDIOTYPINGS AUDIOTYPISTS AUDITORSHIPS AUTODESTRUCT BARDOLATRIES BARDOLATROUS BASTINADOING BEARDTONGUES BIMODALITIES BLADDERWORTS BLAMESTORMED BLASTODERMIC BLOODSTAINED BLOODSTREAMS BOATBUILDERS BODDHISATTVA BODHISATTVAS BODYSNATCHER BOMBARDMENTS BONDSERVANTS BOOTSTRAPPED BRAINSTORMED BROADCASTERS BROADCASTING CARDIOLOGIST CARDIOTONICS CATALOGUISED CATHOLICISED CENTERBOARDS CENTREBOARDS CHARLESTONED CHONDROBLAST CHONDROSTIAN CLEARSTORIED COADJUTRICES COADJUTRIXES COADMINISTER COADUNATIONS COCCIDIOSTAT CODEFENDANTS COEDUCATIONS COLOURCASTED COMMANDMENTS COMMENDATORS COMMISERATED COMRADELIEST CONDENSATING CONDENSATION CONDITIONALS CONDONATIONS CONDUCTANCES CONFEDERATES CONQUISTADOR CONSOLIDATED CONSOLIDATES CONSOLIDATOR CONSTELLATED CONSTERNATED CONSTUPRATED CONTRADANCES CONTREDANCES CONTREDANSES COORDINATORS CORDIALITIES CORPORATISED COTRANSDUCED COTRANSDUCES COUNTERDRAWS COUNTERMANDS COUNTERRAIDS CROSSHATCHED CROSSMATCHED CRYOHYDRATES CRYSTALLOIDS CUSPIDATIONS CYANIDATIONS CYCADOPHYTES CYCLOPAEDIST DACTYLOGRAMS DACTYLOSCOPY DEACTIVATORS DEAMINATIONS DEASPIRATION DEBARCATIONS DEBARKATIONS DECANTATIONS DECAPITATORS DECARBONATES DECELERATORS DECLAMATIONS DECLARATIONS DECLINATIONS DECOLLATIONS DECOLLETAGES DECOMPENSATE DECONGESTANT DECONSECRATE DECORTICATES DECRUSTATION DECURIONATES DECURVATIONS DECUSSATIONS DEFAECATIONS DEFALCATIONS DEFILIATIONS DEFLAGRATORS DEFLATIONIST DEFLORATIONS DEFOLIATIONS DEFORMATIONS DEGRADATIONS DEGUSTATIONS DEHORTATIONS DEHYDRATIONS DEIFICATIONS DEIONISATION DELECTATIONS DELIBERATORS DELINEATIONS DEMARCATIONS DEMARKATIONS DEMIBASTIONS DEMIGRATIONS DEMOCRATISED DEMOCRATISER DEMOCRATISES DEMOCRATISTS DEMOCRATIZES DEMODULATORS DEMOGRAPHIST DEMONETARISE DEMONISATION DEMONOLATERS DEMONSTRABLE DEMONSTRABLY DEMONSTRATED DEMONSTRATES DEMONSTRATOR DENERVATIONS DENIGRATIONS DENITRATIONS DENOMINATORS DENTIROSTRAL DENUNCIATORS DEOXIDATIONS DEOXYGENATES DEPILATORIES DEPLORATIONS DEPLUMATIONS DEPOPULATORS DEPORTATIONS DEPOSITARIES DEPOSITATION DEPOSITIONAL DEPRAVATIONS DEPRECATIONS DEPRECIATORS DEPREDATIONS DEPRIVATIONS DEPUTISATION DEREGULATORS DESALINATION DESALINATORS DESATURATION DESECRATIONS DESICCATIONS DESIDERATION DESIGNATIONS DESOLATENESS DESOLATINGLY DESPERATIONS DESPOLIATION DESPOTICALLY DESPOTOCRACY DESPUMATIONS DESQUAMATION DESQUAMATORY DESTINATIONS DETERIORATES DETESTATIONS DEUTERANOPES DEUTERATIONS DEUTEROPLASM DEUTOPLASMIC DEUTOPLASTIC DEVALUATIONS DEVASTATIONS DEVIATIONISM DEVIATIONIST DIAGNOSTICAL DIALYSATIONS DIALYZATIONS DIAPHORETICS DIAPOSITIVES DIASTEREOMER DIASTROPHISM DIATESSARONS DIATOMACEOUS DIATONICISMS DICHROMATICS DICHROMATISM DICTATORSHIP DICTIONARIES DIFFRACTIONS DIGITISATION DIGLADIATORS DILAPIDATORS DILATOMETERS DILATORINESS DIMERISATION DIMIDIATIONS DIPHOSPHATES DIPLOBLASTIC DIPLOMATESES DIPLOMATISED DIPLOMATISES DIPLOMATISTS DIPLOMATIZES DIPTEROCARPS DIRECTORATES DISACCORDANT DISACCUSTOMS DISAFFECTION DISAFFORESTS DISANOINTING DISAPPOINTED DISASSOCIATE DISASTROUSLY DISAUTHORISE DISAUTHORIZE DISAVENTROUS DISCEPTATION DISCEPTATORS DISCLAMATION DISCONSOLATE DISCORDANTLY DISCORPORATE DISCOUNTABLE DISCRETIONAL DISGRADATION DISGREGATION DISINFLATION DISLOCATEDLY DISLOCATIONS DISLOYALTIES DISMOUNTABLE DISMUTATIONS DISOPERATION DISORIENTATE DISPENSATION DISPENSATORS DISPENSATORY DISPROPRIATE DISPUTATIONS DISPUTATIOUS DISRELATIONS DISSEMINATOR DISSERTATION DISSERTATORS DISSIMULATOR DISSIPATIONS DISSOCIALITY DISSOCIATING DISSOCIATION DISSOCIATIVE DISTILLATION DISTILLATORY DISTORTIONAL DISTRACTIONS DIVARICATORS DIVINISATION DIVULGATIONS DOCKISATIONS DOCKIZATIONS DOCTRINAIRES DOCTRINARISM DODECASTYLES DOMESTICABLE DOMESTICALLY DOMESTICATED DOMESTICATES DOMESTICATOR DOMICILIATES DOMINATRICES DOMINATRIXES DONATISTICAL DOOMWATCHERS DORSIVENTRAL DORSOLATERAL DORSOVENTRAL DOVETAILINGS DOWNDRAUGHTS DOWNSTAIRSES DRACONTIASES DRACONTIASIS DRAFTSPEOPLE DRAFTSPERSON DRAGONFRUITS DREADNOUGHTS DUPLICATIONS DYNAMOMETERS EDIFICATIONS EDITORIALISE EDITORIALIST EDUCATIONESE EDUCATIONIST EDULCORATORS EISTEDDFODAU ELUCIDATIONS ENDOCARDITIS ENDOPARASITE ENDORSATIONS ENDOSKELETAL EPOXIDATIONS ERADICATIONS ETHIONAMIDES EUDAEMONISTS EUDAIMONISTS EXOPEPTIDASE EXPOSTULATED EXTRADITIONS FALDISTORIES FARADISATION FASTIDIOUSLY FECUNDATIONS FELDSPATHOID FELDSPATHOSE FELSPATHOIDS FLUIDISATION FOOLHARDIEST FOOTBREADTHS FOOTDRAGGERS FRACTIONISED GALACTOSIDES GANGSTERDOMS GASTROPODANS GASTROPODOUS GLYCOSYLATED GOALTENDINGS GODDAMNEDEST GODDAUGHTERS GONIATITOIDS GRADIOMETERS GRANDMOTHERS GROUNDWATERS HEADFOREMOST HEADSTRONGLY HEPTAHEDRONS HIPPODAMISTS HOMESTEADERS HOMESTEADING HOSPITALISED HOSPITALIZED HYDROELASTIC HYDROGENATES HYDROLYSATES HYDROLYZATES HYDROPATHICS HYDROPATHIES HYDROPATHIST HYDROSTATICS HYDROXYLATES HYPOSTASISED HYPOSTASIZED HYPOSTATISED HYPOSTATIZED IDEALISATION IDEOPRAXISTS IDOLATRESSES IDOLATRISERS IDOLATRISING IDOLATRIZERS IDOLATROUSLY IDOLISATIONS IDOLIZATIONS IMMORTALISED IMPERSONATED IMPOSTUMATED IMPROVISATED INDENTATIONS INDIGNATIONS INDOMETACINS INDORSATIONS INFEUDATIONS INFORMATISED INTIMIDATORS INVALIDATORS IRIDISATIONS IRIDIZATIONS IRRADIATIONS ISODIAMETRIC JUDICATORIES KETOACIDOSES KETOACIDOSIS KEYBOARDISTS LABIODENTALS LABRADORITES LATITUDINOUS LEATHERGOODS LEATHERWOODS LEPTODACTYLS LEUCOPLASTID LIPIDOPLASTS LIQUIDATIONS LORDOLATRIES MACRODACTYLS MADEFACTIONS MADERISATION MADREPORITES MAISTERDOMES MALEDICTIONS MANDOLINISTS MANDUCATIONS MARTELLANDOS MAYSTERDOMES MEADOWSWEETS MEDIATORSHIP MEGASTARDOMS MIDLITTORALS MISALLOCATED MISCAPTIONED MISCATALOGED MISEDUCATION MODERATENESS MODERATRICES MODERATRIXES MODULARITIES MONOHYDRATES MORTARBOARDS MOTHERBOARDS MOUNTAINSIDE MOUSETRAPPED MOUSTACHIOED MYXEDEMATOUS NARROWCASTED NATIONALISED NEONATICIDES NOMADISATION NONADDITIVES NONATTENDERS NONBROADCAST NONCUSTODIAL NONDELEGATES NONDIABETICS NONGRADUATES NONSTANDARDS NONSTEROIDAL NOTICEBOARDS NUCLEOTIDASE OBDURATENESS OCTAHEDRITES OCTAPEPTIDES OCTAPLOIDIES ODONTOBLASTS ODONTOGRAPHS ODONTOMATOUS ORCHESTRATED ORIENTALISED ORTHODONTIAS ORTHOPAEDICS ORTHOPAEDIES ORTHOPAEDIST OSTRACODERMS OUTDATEDNESS OUTDISTANCED OUTDISTANCES OUTLANDISHLY OUTORGANISED OUTPASSIONED OUTSPREADING OVERADJUSTED OVERASSERTED OVERDEVIATES OVERDRAUGHTS OVEREDUCATES OVERMASTERED OVERSTANDING OVERSTRAINED OVERTRADINGS OXIDISATIONS OXIDIZATIONS PAEDOBAPTISM PAEDOBAPTIST PAEDODONTICS PAEDOLOGISTS PALINDROMIST PARAMASTOIDS PARATHYROIDS PARATYPHOIDS PATHOLOGISED PEDANTOCRATS PENTAHEDRONS PERDURATIONS PERIODONTIAS PETRODOLLARS PHAGOCYTISED PHAGOCYTOSED PHOSPHATIDES PHOSPHATIDIC PHOSPHATIDYL PHOSPHATISED PHOSPHATIZED PHOSPHORATED PHOTOSCANNED PHOTOSTATTED PLASTERBOARD PNEUMATHODES PONDERATIONS POSTACCIDENT POSTCARDLIKE POSTDEADLINE POSTDILUVIAL POSTDILUVIAN POSTDOCTORAL POSTGRADUATE POSTMEDIEVAL POSTMERIDIAN POSTPRANDIAL PREDICATIONS PREDOCTORALS PREDOMINATES PRISMATOIDAL PROCTODAEUMS PROMUSCIDATE PROPAGANDIST PSEUDOMARTYR PTERODACTYLS RADIOCHEMIST RADIOISOTOPE RADIOLOGISTS RADIOMETRIES RADIOPHONIST RADIOTRACERS RALLENTANDOS RATIONALISED REACCUSTOMED REAFFORESTED REAUTHORISED REBROADCASTS RECORDATIONS REDECORATORS REEDUCATIONS REHYDRATIONS REMEDIATIONS REMONSTRATED REOXIDATIONS REPUDIATIONS RERADIATIONS RESPONDENTIA RETARDATIONS RHAPSODISTIC ROADWORTHIES ROCKSTEADIES RODOMONTADES ROMANTICISED SACERDOTALLY SADDLECLOTHS SCATTERGOODS SCRATCHBOARD SEMIDOMINANT SERVANTHOODS SHADOWCASTED SHOOTAROUNDS SHORTCHANGED SIDEROSTATIC SKATEBOARDED SKATEBOARDER SOAPSUDSIEST SOFTHEADEDLY SOLIDARISTIC SOLIDARITIES SOMATOMEDINS SOMERSAULTED SOUNDTRACKED SOUTHLANDERS SPATCHCOCKED SPATTERDOCKS SPEEDBOATING SPERMATOCIDE SPERMATOZOID STADDLESTONE STADIOMETERS STADTHOLDERS STAKEHOLDERS STAKEHOLDING STALLHOLDERS STAPEDECTOMY STARBOARDING STENOCARDIAS STENOGRAPHED STOMATITIDES STOMATODAEUM STONYHEARTED STORYBOARDED STOUTHEARTED STRANDWOLVES STRANGLEHOLD STRAPPADOING STRIDULATION STRIDULATORS STRIDULATORY STRINGBOARDS SUBALLOCATED SUBAUDITIONS SUBDEACONATE SUBDIACONATE SUBDOMINANTS SUBEDITORIAL SUBFEUDATION SUBFEUDATORY SUBORDINATED SUBORDINATES SUBORDINATOR SUPERSTARDOM SURADDITIONS SWITCHBOARDS SYNDACTYLOUS SYNDICATIONS SYNDIOTACTIC TAUTOLOGISED TEETERBOARDS TELECOMMANDS TEMPORALISED TETRAHEDRONS THALIDOMIDES THERMOSTATED THOUSANDFOLD TOLBUTAMIDES TOWARDLINESS TOWARDNESSES TRACTORFEEDS TRADESPEOPLE TRADESPERSON TRADITIONERS TRADITIONIST TRAITORHOODS TRANSDUCTION TRANSDUCTORS TRANSITIONED TRANSLOCATED TRANSPONDERS TRANSPONDORS TRANSUDATION TRANSUDATORY TREPIDACIOUS TREPIDATIONS TREPIDATIOUS TRIADELPHOUS TRICHOMONADS TRIDACTYLOUS TROMBIDIASES TROMBIDIASIS TROPICALISED TRYPANOCIDES UNACCUSTOMED UNADVENTROUS UNASSOCIATED UNAUTHORISED UNDERACTIONS UNDISCORDANT UNFASTIDIOUS UNPATRONISED UNSANCTIONED UNTOWARDNESS UPGRADATIONS UROCHORDATES VALEDICTIONS VASECTOMISED VASECTOMIZED VASODILATION VASODILATORS VASODILATORY VENDITATIONS VINDICATIONS