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