There are 789 fourteen-letter words containing A, D, E, R and T, https://www.bestwordlist.com/c/a/5/14letterwordswithadert.htm ABSTRACTEDNESS ACCREDITATIONS ADDRESSABILITY ADIATHERMANOUS ADMEASUREMENTS ADMINISTRATIVE ADMIRABILITIES ADRENOCORTICAL ADVERTISEMENTS ADVERTIZEMENTS AERODYNAMICIST AFOREMENTIONED AGGRANDISEMENT AGGRANDIZEMENT AGROINDUSTRIES ALDOSTERONISMS ALLOTETRAPLOID AMBIDEXTROUSLY ANAGRAMMATISED ANAGRAMMATIZED ANDROCENTRISMS ANDROMEDOTOXIN ANTIDEMOCRATIC ANTIDEPRESSANT ANTIDEPRESSION ANTIDERIVATIVE ANTIDIARRHEALS ANTIDIARRHOEAL ANTIFEDERALIST ANTIMODERNISTS APERIODICITIES APPRENTICEHOOD APPROPINQUATED ARCHIDIACONATE ARCHIMANDRITES ARCHPRIESTHOOD ARRONDISSEMENT ARTIFICIALISED ARTIFICIALIZED ASSORTEDNESSES ATTITUDINISERS ATTITUDINIZERS AUDIOMETRICIAN AUTODESTRUCTED AUTOTETRAPLOID BACTERICIDALLY BANDERSNATCHES BIGHEARTEDNESS BIODEGRADATION BIOREMEDIATION BOWDLERISATION BOWDLERIZATION BREASTFEEDINGS BUREAUCRATISED BUREAUCRATIZED BUTYRALDEHYDES CANDLELIGHTERS CARDIOCENTESES CARDIOCENTESIS CATHODOGRAPHER CELEBRATEDNESS CHATEAUBRIANDS CHICKENHEARTED CHLOROTHIAZIDE CHLORTHALIDONE CHONDROMATOSES CIRCUMVALLATED CLAIRAUDIENTLY COADMINISTERED COASTGUARDSMEN COLLATERALISED COLLATERALIZED CONCENTRATEDLY CONFEDERATIONS CONNATURALISED CONNATURALIZED CONQUISTADORES CONSIDERATIONS CONSUETUDINARY CONTAINERBOARD CONTRACTEDNESS CONTRADICTABLE CONTRAINDICATE COORDINATENESS CORINTHIANISED CORINTHIANIZED COSTARDMONGERS COUNTERCHANGED COUNTERCHARGED COUNTERCHARMED COUNTERCLAIMED COUNTERDEMANDS COUNTERDRAWING COUNTERMANDING COUNTERMARCHED COUNTERPLANNED COUNTERPLEADED COUNTERRAIDING COUNTERRALLIED COUNTERSHADING COUNTERSTAINED COUNTERTRADING CREDENTIALINGS CREDENTIALISMS CREDENTIALLING CREDITABLENESS CROTONALDEHYDE CYPROHEPTADINE DACTYLOGRAPHER DAGUERREOTYPED DAGUERREOTYPER DAGUERREOTYPES DAREDEVILTRIES DAUGHTERBOARDS DAUGHTERLINESS DEAMBULATORIES DEARTICULATING DECARBONATIONS DECARBOXYLATED DECARBOXYLATES DECARBURATIONS DECENTRALISING DECENTRALIZING DECEREBRATIONS DECHLORINATING DECHLORINATION DECHRISTIANISE DECHRISTIANIZE DECOLORISATION DECOLORIZATION DECONCENTRATED DECONCENTRATES DECONSECRATING DECONSECRATION DECONTAMINATOR DECORATIVENESS DECORTICATIONS DECREPITATIONS DEFENESTRATING DEFENESTRATION DEFIBRILLATING DEFIBRILLATION DEFIBRILLATORS DEFIBRINATIONS DEFLAGRABILITY DEFORESTATIONS DEGENERATENESS DEGRANULATIONS DEHYDROGENATED DEHYDROGENATES DELIBERATENESS DELIBERATIVELY DELIRIFACIENTS DELIVERABILITY DEMATERIALISED DEMATERIALISES DEMATERIALIZED DEMATERIALIZES DEMILITARISING DEMILITARIZING DEMOCRATICALLY DEMONETARISING DEMONETARIZING DEMONSTRATIONS DEMONSTRATIVES DEMORALISATION DEMORALIZATION DENATURALISING DENATURALIZING DENITRIFICATOR DENUMERABILITY DEODORISATIONS DEODORIZATIONS DEPARTMENTALLY DEPOLARISATION DEPOLARIZATION DEPRECIATINGLY DEREALISATIONS DEREALIZATIONS DEREGISTRATION DERIVATIONALLY DERIVATIONISTS DERIVATISATION DERIVATIVENESS DERIVATIZATION DERMATOGLYPHIC DERMATOGRAPHIA DERMATOGRAPHIC DERMATOLOGICAL DERMATOLOGISTS DERMATOPLASTIC DEROGATORINESS DESEGREGATIONS DESERTISATIONS DESERTIZATIONS DESIRABILITIES DESPIRITUALISE DESPIRITUALIZE DESPOTOCRACIES DESQUAMATORIES DESULFURATIONS DESULPHURATING DESULPHURATION DETERIORATIONS DETERMINATIONS DETERMINATIVES DEUTERAGONISTS DEUTEROGAMISTS DEVALORISATION DEVALORIZATION DEXTROCARDIACS DEXTROROTATION DEXTROROTATORY DIAGEOTROPISMS DIAHELIOTROPIC DIAMANTIFEROUS DIAPHANOMETERS DIASTEREOMERIC DIATHERMANCIES DIATHERMANEITY DICHLOROETHANE DIELECTRICALLY DIFFARREATIONS DIFFERENTIABLE DIFFERENTIALLY DIFFERENTIATED DIFFERENTIATES DIFFERENTIATOR DIFFRACTOMETER DIFFRACTOMETRY DILATORINESSES DIMENHYDRINATE DIPTEROCARPOUS DIRECTIONALITY DISACCREDITING DISADVENTUROUS DISAFFORESTING DISAGGREGATING DISAGGREGATION DISAGGREGATIVE DISAPPROBATIVE DISAPPROPRIATE DISARRANGEMENT DISARTICULATED DISARTICULATES DISCEPTATORIAL DISCOMBOBERATE DISCOMFORTABLE DISCOURAGEMENT DISCRETIONALLY DISCRIMINATELY DISCRIMINATIVE DISEMBARKATION DISEMBARKMENTS DISENCHANTRESS DISENTHRALLING DISENTHRALMENT DISENTRAINMENT DISEQUILIBRATE DISFEATUREMENT DISFORESTATION DISHEARTENMENT DISINCARCERATE DISINCORPORATE DISINHERITANCE DISINTEGRATING DISINTEGRATION DISINTEGRATIVE DISINTEGRATORS DISINVIGORATED DISINVIGORATES DISNATURALISED DISNATURALISES DISNATURALIZED DISNATURALIZES DISORIENTATING DISORIENTATION DISPARAGEMENTS DISPENSATORIES DISPENSATORILY DISREPUTATIONS DISRESPECTABLE DISSERTATIONAL DISSEVERATIONS DISSYMMETRICAL DISTEMPERATURE DISTRACTEDNESS DISTRIBUTARIES DIURETICALNESS DIVERTICULATED DOCTRINALITIES DOCUMENTARIANS DOCUMENTARISED DOCUMENTARISES DOCUMENTARISTS DOCUMENTARIZED DOCUMENTARIZES DORSIVENTRALLY DORSOVENTRALLY DOSIMETRICIANS DOWNREGULATION DRAPEABILITIES DRAUGHTINESSES DRAUGHTPROOFED DRAUGHTSPERSON DRILLABILITIES DRINKABILITIES DRIVEABILITIES DYNAMOELECTRIC DYNAMOMETRICAL EDITORIALISERS EDITORIALISING EDITORIALIZERS EDITORIALIZING EDRIOPHTHALMIC ELECTRODYNAMIC EMPYREUMATISED EMPYREUMATIZED ENANTIODROMIAS ENDARTERECTOMY ENDEAVOURMENTS ENDOCARDITIDES ENDOCARDITISES ENDOCRINOPATHY ENDOPARASITISM ENDURABILITIES EPIGRAMMATISED EPIGRAMMATIZED EQUIPONDERATED EQUIPONDERATES EXTRAORDINAIRE EXTRAPYRAMIDAL FAINTHEARTEDLY FARFETCHEDNESS FARSIGHTEDNESS FEATHERBEDDING FEATHERBRAINED FEDERALISATION FEDERALIZATION FINGERBREADTHS FOREORDAINMENT FOREORDINATION FRACTIONALISED FRACTIONALIZED FRAUDULENTNESS GASTRODUODENAL GLUTARALDEHYDE GRANDDAUGHTERS GRANDFATHERING GREATHEARTEDLY HANDICRAFTSMEN HEADMASTERLIER HEADMASTERSHIP HEADMISTRESSES HEADQUARTERING HEADSTRONGNESS HEARTRENDINGLY HEAVYHEARTEDLY HEREDITABILITY HEREDITARINESS HERMAPHRODITES HERMAPHRODITIC HYDROEXTRACTOR HYDROGENATIONS HYDROKINETICAL HYDROMAGNETICS HYDROPNEUMATIC HYDROSULPHATES HYDROTHERAPIES HYDROTHERAPIST HYDROTHERMALLY HYDROXYAPATITE HYPERACIDITIES HYPERDACTYLIES IDOLATROUSNESS IMMATERIALISED IMMATERIALIZED IMMODERATENESS IMPARIDIGITATE INADVERTENCIES INDEMONSTRABLE INDEMONSTRABLY INDETERMINABLE INDETERMINABLY INDISCRIMINATE INDUSTRIALISED INDUSTRIALISES INDUSTRIALIZED INDUSTRIALIZES INORDINATENESS INSUBORDINATES INTERDIALECTAL INTERDIGITATED INTERDIGITATES INTERGRADATION INTERJACULATED INTERLAMINATED INTERMEDIACIES INTERMEDIARIES INTERMEDIATELY INTERMEDIATING INTERMEDIATION INTERMEDIATORS INTERMEDIATORY INTEROSCULATED INTERPERMEATED INTERRELATEDLY INTRAMEDULLARY IODOMETRICALLY IRRATIONALISED IRRATIONALIZED ISODIAMETRICAL KINDERGARTENER KINDERGARTNERS LABRADORESCENT LEGERDEMAINIST LIGHTHEARTEDLY MACRODACTYLIES MALADMINISTERS MALAPPORTIONED MELODRAMATISED MELODRAMATISES MELODRAMATISTS MELODRAMATIZED MELODRAMATIZES METAGRABOLISED METAGRABOLIZED METAGROBOLISED METAGROBOLIZED METOCLOPRAMIDE METRONIDAZOLES MISADVENTURERS MISADVENTUROUS MISADVERTENCES MISAPPRECIATED MISARTICULATED MISTRANSCRIBED MISUNDERSTANDS MODERATENESSES MODERATORSHIPS MODERNISATIONS MODERNIZATIONS MULTIBARRELLED MULTICHAMBERED MULTITHREADING NANOSTRUCTURED NEANDERTHALERS NEANDERTHALOID NEMATODIRIASES NEMATODIRIASIS NONDEGENERATES NONDERIVATIVES NONDIRECTIONAL NONDOCTRINAIRE NONDOCUMENTARY NONRADIOACTIVE NONRESIDENTIAL NORTHEASTWARDS NORTHWESTWARDS NUDIBRANCHIATE OBDURATENESSES OBEDIENTIARIES ODONTOGRAPHIES ORTHOGONALISED ORTHOGONALIZED ORTHOPEDICALLY OSTEODERMATOUS OUTRECUIDANCES OVARIECTOMISED OVARIECTOMIZED OVERABUNDANTLY OVERADJUSTMENT OVERADVERTISED OVERADVERTISES OVERADVERTIZED OVERADVERTIZES OVERDECORATING OVERDECORATION OVERDRAMATISED OVERDRAMATISES OVERDRAMATIZED OVERDRAMATIZES OVEREDUCATIONS OVERELABORATED OVERFASTIDIOUS OVERMEDICATING OVERMEDICATION OVERORNAMENTED OVERSPECULATED OVERSTIMULATED OXIDOREDUCTASE PACHYDERMATOUS PAEDIATRICIANS PANCREATITIDES PANRADIOMETERS PARTICLEBOARDS PARTICULARISED PARTICULARIZED PARTRIDGEBERRY PEDANTOCRACIES PEDESTRIANISED PEDESTRIANISES PEDESTRIANISMS PEDESTRIANIZED PEDESTRIANIZES PERFECTIONATED PERICARDITIDES PERICARDITISES PERIODICALISTS PERIODISATIONS PERIODIZATIONS PERISSODACTYLE PERISSODACTYLS PERSUADABILITY PHOSPHORYLATED PLATITUDINISER PLATITUDINIZER POSTDOCTORATES PREADAPTATIONS PREADMONITIONS PREADOLESCENTS PRECEDENTIALLY PREDESIGNATING PREDESIGNATION PREDESIGNATORY PREDESTINARIAN PREDESTINATING PREDESTINATION PREDESTINATIVE PREDESTINATORS PREDETERMINATE PREDEVALUATION PREDICTABILITY PREDOMINATIONS PREESTABLISHED PREJUDICATIONS PREMEDICATIONS PREMEDITATEDLY PREMEDITATIONS PREORDAINMENTS PREORDINATIONS PREPONDERANTLY PREPONDERATELY PREPONDERATING PREPONDERATION PRESIDENTIALLY PROCRASTINATED PROGNOSTICATED PROPAEDEUTICAL PROPORTIONATED PROTOCHORDATES PROTRACTEDNESS PROVIDENTIALLY PRUDENTIALISMS PRUDENTIALISTS PSEUDARTHROSES PSEUDARTHROSIS PSEUDOPREGNANT PTERIDOLOGICAL PUNDITOCRACIES QUADRIGEMINATE QUADRILATERALS QUADRILITERALS QUADRISECTIONS QUADRUMVIRATES QUADRUPLICATED QUADRUPLICATES QUARTERDECKERS QUARTODECIMANS QUODLIBETARIAN RADIESTHESISTS RADIOACTIVATED RADIOACTIVATES RADIOCHEMISTRY RADIORESISTANT RADIOSENSITISE RADIOSENSITIVE RADIOSENSITIZE RADIOTELEGRAMS RADIOTELEGRAPH RADIOTELEMETER RADIOTELEMETRY RADIOTELEPHONE RADIOTELEPHONY RADIOTELETYPES RADIOTHERAPIES RADIOTHERAPIST REACCLIMATISED REACCLIMATIZED READMINISTERED REAPPROPRIATED REBROADCASTING RECODIFICATION RECOMMENDATION RECOMMENDATORY RECONCENTRATED RECONDENSATION RECONSOLIDATED RECONSOLIDATES RECONTAMINATED RECRYSTALLISED RECRYSTALLIZED REDINTEGRATING REDINTEGRATION REDINTEGRATIVE REDISCOUNTABLE REDISTILLATION REDUPLICATIONS REHOSPITALISED REHOSPITALIZED REINCORPORATED REINTERROGATED REINVESTIGATED REMANUFACTURED REMATERIALISED REMATERIALIZED RENATIONALISED RENATIONALIZED REORCHESTRATED REPHOTOGRAPHED REPUDIATIONIST RESIDENTIARIES RESTRAINEDNESS RESYSTEMATISED RESYSTEMATIZED RETROGRADATION REVENDICATIONS REVINDICATIONS RHEUMATOIDALLY ROADWORTHINESS ROUNDABOUTEDLY ROUNDABOUTNESS RUGGEDISATIONS RUGGEDIZATIONS SACERDOTALISED SACERDOTALISES SACERDOTALISMS SACERDOTALISTS SACERDOTALIZED SACERDOTALIZES SCATTERBRAINED SCHOOLMASTERED SCRATCHBUILDER SERODIAGNOSTIC SHERARDISATION SHERARDIZATION SKATEBOARDINGS SLANTENDICULAR SOUTHEASTWARDS SOUTHWESTWARDS STADHOLDERATES STADHOLDERSHIP STADTHOLDERATE STARCHEDNESSES STERNOMASTOIDS STOUTHEARTEDLY STRAITJACKETED STRANDEDNESSES STRUCTURALISED STRUCTURALIZED SUBCATEGORISED SUBCATEGORIZED SUBDEPARTMENTS SUBINFEUDATORY SUBSIDIARITIES SUPERADDITIONS SUPERDAINTIEST SUPERDELEGATES SUPERDIPLOMATS SUPERDOMINANTS SUPERINSULATED SUPERORDINATED SUPERORDINATES SUPERSATURATED SUSPERCOLLATED SWEATERDRESSES TATTERDEMALION TENDERISATIONS TENDERIZATIONS TETARTOHEDRISM TETRACHLORIDES TETRADACTYLIES TETRADACTYLOUS TETRADRACHMONS TETRAETHYLLEAD TETRAFLUORIDES THEATRICALISED THEATRICALIZED THENCEFORWARDS THERMODYNAMICS THIOCARBAMIDES THOROUGHBRACED THREADBARENESS THUNDERFLASHES TOWARDLINESSES TRADITIONALISE TRADITIONALIZE TRANSACTINIDES TRANSCENDENCES TRANSCENDENTAL TRANSCENDENTLY TRANSCENDINGLY TRANSGENDERISM TRANSISTORISED TRANSISTORIZED TRANSLITERATED TRANSMOGRIFIED TRAPEZOHEDRONS TREPIDATIOUSLY TRICHOMONACIDE TRIDIMENSIONAL TRIIODOMETHANE TRIMETHADIONES TRISACCHARIDES TRISOCTAHEDRAL TRISOCTAHEDRON ULTRACIVILISED ULTRACIVILIZED ULTRACREPIDATE ULTRAMODERNISM ULTRAMODERNIST ULTRAWIDEBANDS UNACCULTURATED UNAPPROPRIATED UNCERTIFICATED UNCONFEDERATED UNCONTRADICTED UNCORROBORATED UNCREDENTIALED UNCRYSTALLISED UNCRYSTALLIZED UNDEMONSTRABLE UNDEMONSTRATED UNDERESTIMATED UNDERESTIMATES UNDERGRADUATES UNDERGRADUETTE UNDERINFLATION UNDERPAINTINGS UNDERPOPULATED UNDERREACTIONS UNDERSATURATED UNDERSECRETARY UNDERSTAFFINGS UNDERSTANDABLE UNDERSTANDABLY UNDERSTANDINGS UNDERSTATEMENT UNDERSTRAPPERS UNDERSTRAPPING UNDERTENANCIES UNDERVALUATION UNDESIRABILITY UNDETERMINABLE UNDETERMINABLY UNDISTRACTEDLY UNDOCTRINAIRES UNFRACTIONATED UNIDIRECTIONAL UNINCORPORATED UNMANUFACTURED UNMATERIALISED UNMATERIALIZED UNMATRICULATED UNPREDICTABLES UNPREMEDITABLE UNPREMEDITATED UNRECIPROCATED UNREFRIGERATED UNRESTRAINEDLY UNROMANTICISED UNROMANTICIZED UNSTANDARDISED UNSTANDARDIZED UNTHRIFTIHEADS UNTHRIFTYHEADS UNTOWARDLINESS UNTOWARDNESSES UPGRADEABILITY VALEDICTORIANS VALETUDINARIAN VALETUDINARIES VERIDICALITIES VINDICATRESSES WATERBOARDINGS WATERFLOODINGS WEATHERBOARDED WEATHERPROOFED WHOLEHEARTEDLY