There are 528 twelve-letter words containing A, D, L, N and T, https://www.bestwordlist.com/c/a/5/12letterwordswithadlnt.htm
ACCIDENTALLY ACETANILIDES ACIDULATIONS ADAPTATIONAL ADDITIONALLY
ADJUNCTIVELY ADJUSTMENTAL ADMINICULATE ADMONITORILY ADOLESCENTLY
ADULARESCENT ADULTERATING ADULTERATION ADULTERISING ADULTERIZING
ADULTESCENTS ADVENTUREFUL AGGLUTINATED ALDOLISATION ALDOLIZATION
ALDOPENTOSES ALDOSTERONES ALEXANDRITES ALLOANTIBODY ALTITUDINOUS
AMIANTHOIDAL AMONTILLADOS ANDOUILLETTE ANDROLOGISTS ANECDOTALISM
ANECDOTALIST ANISODACTYLS ANTECEDENTLY ANTEDILUVIAL ANTEDILUVIAN
ANTEPRANDIAL ANTHOLOGISED ANTHOLOGIZED ANTHROPOIDAL ANTIDILUTION
ASTOUNDINGLY AUTODIALLING BATTLEGROUND BATTLEMENTED BEADBLASTING
BEDAZZLEMENT BESTRADDLING BIOIDENTICAL BLANDISHMENT BLANKETWEEDS
BLOODSTAINED BOATBUILDING CALENDARISTS CANDESCENTLY CANDLELIGHTS
CANDLESTICKS CANTILEVERED CARBONYLATED CARDINALATES CARUNCULATED
CHARLESTONED CHLORIDATING CHONDROBLAST CLADOGENETIC CLAIRAUDIENT
CLAUDICATION COINCIDENTAL COLOQUINTIDA CONCORDANTLY CONDITIONALS
CONDUCTIONAL CONDUCTORIAL CONDUPLICATE CONFABULATED CONFIDENTIAL
CONFLAGRATED CONSOLIDATED CONSOLIDATES CONSOLIDATOR CONSTELLATED
CONTEMPLATED CONTRACTEDLY COORDINATELY COTYLEDONARY COUNTERPLEAD
CREDENTIALED CYCLANDELATE DAUGHTERLING DAYLIGHTINGS DEBILITATING
DEBILITATION DECELERATING DECELERATION DECENTRALISE DECENTRALIST
DECENTRALIZE DECHLORINATE DECLAMATIONS DECLARATIONS DECLINATIONS
DECLINATURES DECOLLATIONS DECOLORATING DECOLORATION DECUMULATION
DEDICATIONAL DEERSTALKING DEFALCATIONS DEFILIATIONS DEFINABILITY
DEFINITIONAL DEFLAGRATING DEFLAGRATION DEFLATIONARY DEFLATIONIST
DEFLECTIONAL DEFLOCCULANT DEFLORATIONS DEFOLIATIONS DEGENERATELY
DEGLACIATION DEGLUTINATED DEGLUTINATES DELAMINATING DELAMINATION
DELASSEMENTS DELECTATIONS DELIBERATING DELIBERATION DELICATENESS
DELICATESSEN DELIMITATING DELIMITATION DELINEATIONS DEMODULATING
DEMODULATION DEMONOLATERS DEMONSTRABLE DEMONSTRABLY DEMYELINATED
DEMYELINATES DENATURALISE DENATURALIZE DENOTATIVELY DENTICULATED
DENTILINGUAL DENTIROSTRAL DEOPPILATING DEOPPILATION DEPARTMENTAL
DEPLORATIONS DEPLUMATIONS DEPOPULATING DEPOPULATION DEPOSITIONAL
DEREGULATING DEREGULATION DERIVATIONAL DESALINATING DESALINATION
DESALINATORS DESOLATENESS DESOLATINGLY DESPOLIATION DETAILEDNESS
DETASSELLING DETERMINABLE DETERMINABLY DETONABILITY DETRACTINGLY
DETRIMENTALS DEVALUATIONS DEVITALISING DEVITALIZING DEVOTIONALLY
DIAGNOSTICAL DIALECTICIAN DIALYSATIONS DIALYZATIONS DIATONICALLY
DIETHYLAMINE DIFFERENTIAL DIFUNCTIONAL DIGITALISING DIGITALIZING
DIGLADIATING DIGLADIATION DILACERATING DILACERATION DILAPIDATING
DILAPIDATION DILATATIONAL DILATORINESS DILETTANTISH DILETTANTISM
DILUCIDATING DILUCIDATION DIPROPELLANT DISABLEMENTS DISANNULMENT
DISCIPLINANT DISCLAMATION DISCONSOLATE DISCORDANTLY DISCOUNTABLE
DISCREPANTLY DISCRETIONAL DISCULPATING DISENTAILING DISENTANGLED
DISENTANGLES DISENTHRALLS DISENTRAILED DISENTRAYLED DISENTRAYLES
DISINFLATION DISLOCATIONS DISMANTLINGS DISMOUNTABLE DISPLACEMENT
DISPLEASANTS DISRELATIONS DISTANCELESS DISTILLATION DISTORTIONAL
DISTRAINABLE DIVINATORIAL DIVULGATIONS DOCTRINALITY DOCUMENTABLE
DOMINATINGLY DONATISTICAL DORSIVENTRAL DORSOVENTRAL DOVETAILINGS
DRINKABILITY DUPLICATIONS DYNASTICALLY EDULCORATING EDULCORATION
ELATEDNESSES ELUCIDATIONS ENARTHRODIAL ENCAPSULATED ENCULTURATED
ENDOSKELETAL ENDOTHELIOMA ENDOTRACHEAL ENDURABILITY ENTERDEALING
ENTRAMMELLED ETHNOMEDICAL EVENTUALISED EVENTUALIZED EVIDENTIALLY
EXPEDIENTIAL EXTERNALISED EXTERNALIZED FANTASYLANDS FARTHINGLAND
FASCINATEDLY FAULTFINDERS FAULTFINDING FLUIDISATION FLUIDIZATION
FLUORIDATING FLUORIDATION FOUNDATIONAL FRAUDULENTLY FUNAMBULATED
FUNDAMENTALS GANGLIONATED GANGSTERLAND GLADIATORIAN GLYCERINATED
GOALTENDINGS HALLUCINATED HEADSTRONGLY HUSBANDLIEST IDEALISATION
IDEALIZATION IDEATIONALLY IDENTIFIABLE IDENTIFIABLY IDOLATRISING
IDOLATRIZING IDOLISATIONS IDOLIZATIONS IMPEDIMENTAL INADEQUATELY
INAUDIBILITY INCAPSULATED INCIDENTALLY INDELICATELY INDETECTABLE
INDICATIONAL INDICATIVELY INDISPUTABLE INDISPUTABLY INDOLEACETIC
INDUPLICATED INDUSTRIALLY INELABORATED INFANTICIDAL INFANTILISED
INFANTILIZED INFATUATEDLY INFLATEDNESS INORDINATELY INSECTICIDAL
INTERCALATED INTERDEALERS INTERDEALING INTERDIALECT INTERDIGITAL
INTERLACEDLY INTERLARDING INTERLAYERED INTERNALISED INTERNALIZED
INTERPLANTED INTERPLEADED INTERPLEADER INTERPOLATED INTERRELATED
INTERSTADIAL INTERTANGLED INTERTIDALLY INTRACARDIAL INVALIDATING
INVALIDATION INVALIDATORS INVALIDITIES JUDGMENTALLY LABIODENTALS
LANDAULETTES LANDGRAVATES LANDGRAVIATE LANDSCAPISTS LANDSKNECHTS
LARYNGITIDES LATEENRIGGED LATIFUNDIUMS LATITUDINOUS LAUNDERETTES
LEATHERBOUND LEPIDOPTERAN LIQUIDATIONS LONGICAUDATE LONGITUDINAL
MALCONTENTED MALEDICTIONS MALIMPRINTED MALTODEXTRIN MANDIBULATED
MANDIBULATES MANDOLINISTS MARTELLANDOS MEDICAMENTAL METALLIDINGS
MULTIDENTATE MULTIPLICAND NAPHTHALISED NAPHTHALIZED NATIONALISED
NATIONALIZED NEANDERTALER NEANDERTHALS NEEDLECRAFTS NIGGARDLIEST
NONCUSTODIAL NONDELEGATES NONEDITORIAL NONIDENTICAL NONNUCLEATED
NONREGULATED NONSTEROIDAL NUCLEOTIDASE OCCIDENTALLY ODONTOBLASTS
ODONTOPHORAL ORIENTALISED ORIENTALIZED OUTGENERALED OUTLANDISHLY
OUTVILLAINED OVERINFLATED PALINDROMIST PALUDAMENTUM PASTURELANDS
PEDANTICALLY PEDESTALLING PEDICULATION PEDUNCULATED PENINSULATED
PENTADACTYLE PENTADACTYLS PENTADACTYLY PENTLANDITES PINNATIFIDLY
PLANTIGRADES PLATITUDINAL POSTDEADLINE POSTDILUVIAN POSTPRANDIAL
PRECEDENTIAL PREINSTALLED PRESIDENTIAL PRODUCTIONAL PROVIDENTIAL
PRUDENTIALLY QUADRIVALENT QUINDECAPLET RADIOELEMENT RALLENTANDOS
RATIONALISED RATIONALIZED REDEMPTIONAL REINOCULATED RESTRAINEDLY
RETRANSLATED REVALIDATING REVALIDATION ROUNDABOUTLY RUDIMENTALLY
SANCTIFIEDLY SANDBLASTERS SANDBLASTING SCINTILLATED SEDIMENTABLE
SOUTHLANDERS STADDLESTONE STAKEHOLDING STANDARDLESS STAPHYLINIDS
STELLERIDANS STICKHANDLED STICKHANDLER STICKHANDLES STRANDWOLVES
STRANGLEHOLD STRANGULATED STRIDULANCES STRIDULANTLY STRIDULATING
STRIDULATION STRINGHALTED STUDDINGSAIL SYNADELPHITE SYNDACTYLIES
SYNDACTYLISM SYNDACTYLOUS SYNDETICALLY SYNDICALISTS TELECOMMANDS
TENDENCIALLY TENDENTIALLY THEATERLANDS THEATRELANDS THOUSANDFOLD
THUNDERCLAPS THUNDERFLASH TOWARDLINESS TRANQUILISED TRANQUILIZED
TRANSLOCATED TRANSPLANTED TRIANGULATED TRYPANOCIDAL TYRANNICIDAL
ULTRADISTANT ULTRAMUNDANE ULTRAREFINED UNACCLIMATED UNADULTERATE
UNAFFECTEDLY UNAFFILIATED UNALLEVIATED UNASSISTEDLY UNCALCULATED
UNCALIBRATED UNCATALOGUED UNCELEBRATED UNCIRCULATED UNCORRELATED
UNCREDITABLE UNCULTIVATED UNDEFEATABLE UNDEFOLIATED UNDELECTABLE
UNDELIBERATE UNDERBLANKET UNDERLAYMENT UNDERPLANTED UNDERTAKABLE
UNDETECTABLE UNDETECTABLY UNDIPLOMATIC UNDISMANTLED UNDISPUTABLE
UNDISPUTABLY UNDULATINGLY UNDUPLICATED UNELABORATED UNENTHRALLED
UNFORMULATED UNGUICULATED UNIDEALISTIC UNINOCULATED UNLIQUIDATED
UNMETHODICAL UNMYELINATED UNSPECTACLED UNSTIMULATED UNSUBLIMATED
UNTRAMMELLED UNTRANSLATED UNVENTILATED VACATIONLAND VALEDICTIONS
VALETUDINARY VASODILATION VENTROMEDIAL WALDSTERBENS WILDCATTINGS
WINDLESTRAES WINDLESTRAWS ZALAMBDODONT