There are 497 twelve-letter words containing 2A, D, E and I, https://www.bestwordlist.com/c/a/5/12letterwordswithaadei.htm
ABECEDARIANS ABSINTHIATED ACADEMICALLY ACADEMICIANS ACADEMICISMS
ACCIDENTALLY ACCLIMATISED ACCLIMATIZED ACCORDANCIES ACCREDITABLE
ACETANILIDES ACHROMATISED ACHROMATIZED ACIDANTHERAS ACQUITTANCED
ADAPTIVENESS ADAPTIVITIES ADENOPATHIES ADJECTIVALLY ADJUDICATIVE
ADMINICULATE ADMINISTRATE ADULTERATING ADULTERATION ADVERBIALISE
ADVERBIALIZE ADVERGAMINGS ADVERSATIVES ADVERTORIALS AERODYNAMICS
AFFRANCHISED AGGLUTINATED AGGRANDISERS AGGRANDIZERS AGUARDIENTES
ALDERMANLIER ALDERMANLIKE ALDERMANRIES ALDERMANSHIP ALEXANDRINES
ALEXANDRITES ALPHABETISED ALPHABETIZED AMPHIDENTATE ANECDOTALISM
ANECDOTALIST ANIMADVERTED ANIMADVERTER ANTEDILUVIAL ANTEDILUVIAN
ANTEMERIDIAN ANTEPRANDIAL ANTIACADEMIC ANTIADITISES ANTIANDROGEN
ANTICATHODES ANTIDIABETIC ANTIPREDATOR APODEICTICAL APPENDICULAR
APPROPRIATED APPROXIMATED ARABINOSIDES ARCHDIOCESAN ARTERIALISED
ARTERIALIZED ASCENDANCIES ASSAFOETIDAS ASSASSINATED ASTEROIDEANS
ATTENDANCIES BACKPEDALING BACTERICIDAL BALLADEERING BANDEIRANTES
BARDOLATRIES BARRAMUNDIES BASTARDLIEST BEADBLASTING BLACKLEADING
BRADYKINESIA BREAKDANCING CAESALPINOID CALENDARISED CALENDARISES
CALENDARISTS CALENDARIZED CALENDARIZES CALLIGRAPHED CAMARADERIES
CANDIDATURES CANNIBALISED CANNIBALIZED CARBAMIDINES CARDBOARDIER
CARDINALATES CARDIOMEGALY CARDIOPLEGIA CATALOGUISED CATALOGUIZED
CHAMBERMAIDS CLAIRAUDIENT COMPAGINATED CONTAMINATED CRACKBRAINED
CURVICAUDATE CYCLOPAEDIAS DAMASCEENING DAMASCENINGS DAMASKEENING
DARRAIGNMENT DASTARDLIEST DAYDREAMIEST DAYDREAMINGS DAYDREAMLIKE
DEACTIVATING DEACTIVATION DEACTIVATORS DEAMINATIONS DEARTICULATE
DEASPIRATING DEASPIRATION DEBARCATIONS DEBARKATIONS DEBARRASSING
DECAFFEINATE DECALCOMANIA DECANTATIONS DECAPITALISE DECAPITALIZE
DECAPITATING DECAPITATION DECAPITATORS DECASUALISED DECASUALISES
DECASUALIZED DECASUALIZES DECASYLLABIC DECLAMATIONS DECLARATIONS
DEDICATIONAL DEDICATORIAL DEDRAMATISED DEDRAMATISES DEDRAMATIZED
DEDRAMATIZES DEFAECATIONS DEFALCATIONS DEFAMATORILY DEFLAGRATING
DEFLAGRATION DEFLATIONARY DEFRAUDATION DEGLACIATION DEGRADATIONS
DELAMINATING DELAMINATION DEMARCATIONS DEMARKATIONS DEMOCRATICAL
DEMONIACALLY DEMONOMANIAS DENATURALISE DENATURALIZE DENATURATION
DEPRAVATIONS DERACIALISED DERACIALISES DERACIALIZED DERACIALIZES
DERACINATING DERACINATION DERIVATIONAL DERMABRASION DERMAPLANING
DESACRALISED DESACRALISES DESACRALIZED DESACRALIZES DESALINATING
DESALINATION DESALINATORS DESATURATING DESATURATION DESQUAMATING
DESQUAMATION DESQUAMATIVE DEUTERANOPIA DEVALUATIONS DEVASTATIONS
DEXTROCARDIA DIAGNOSEABLE DIAGONALISED DIAGONALISES DIAGONALIZED
DIAGONALIZES DIAGRAMMABLE DIALECTICIAN DIAMAGNETISM DIATESSARONS
DIATHERMANCY DIATOMACEOUS DIAZOMETHANE DIBRANCHIATE DICARPELLARY
DILACERATING DILACERATION DISACCHARIDE DISADVANTAGE DISAFFILIATE
DISAGGREGATE DISAGREEABLE DISAGREEABLY DISALLOWABLE DISALLOWANCE
DISAMBIGUATE DISANALOGIES DISAPPEARING DISARMAMENTS DISASSOCIATE
DISCALCEATES DISEMBARRASS DISPLACEABLE DISPLEASANCE DISPLEASANTS
DISTRACTABLE DISTRAINABLE DIVARICATELY DODECAGYNIAN DRACONTIASES
DRAMATISABLE DRAMATIZABLE DRAMATURGIES DRAPEABILITY DUNIEWASSALS
DUNNIEWASSAL DYSAESTHESIA DYSPAREUNIAS EMPARADISING ENARTHRODIAL
ENCARNALISED ENCARNALIZED ENDOPARASITE ENGARLANDING EQUIBALANCED
ERADICATIONS EUTHANATISED EUTHANATIZED EXTRADITABLE FAINTHEARTED
FAMILIARISED FAMILIARIZED FASCICULATED FASCINATEDLY FOUNTAINHEAD
FRACTIONATED GALACTOSIDES GALLIARDISES GALRAVITCHED GANGLIONATED
GEODYNAMICAL GRADUALITIES GRADUATESHIP GRANDDADDIES GRANDPAPPIES
HAEMODYNAMIC HAIRBREADTHS HAIRSBREADTH HALLUCINATED HANDICAPPERS
HANDICRAFTER HARLEQUINADE HARUSPICATED HEADBANGINGS HEADREACHING
HERALDICALLY HEREDITARIAN HEXADACTYLIC HEXADECANOIC HEXADECIMALS
HEXAGRAMMOID HOLIDAYMAKER HOLLANDAISES HYDRALAZINES HYPNOPAEDIAS
HYRACOIDEANS IDEALISATION IDEALIZATION IDEATIONALLY INADEQUACIES
INADEQUATELY INCAPSULATED INCARCERATED INCARDINATED INCARDINATES
INCARNADINED INCARNADINES INELABORATED INERADICABLE INERADICABLY
INFATUATEDLY INSTAGRAMMED INSTANTIATED INTERCALATED INTERSTADIAL
INTRAMUNDANE IRRADIANCIES LABIODENTALS LABRADORITES LAGGARDLIEST
LANDGRAVIATE LANDGRAVINES LOADSAMONIES LOGODAEDALIC LONGICAUDATE
MACADAMISERS MACADAMIZERS MACHICOLATED MADEFACTIONS MADERISATION
MADERIZATION MADREPORIANS MAENADICALLY MAIDSERVANTS MAINSTREAMED
MAINTENANCED MALADJUSTIVE MANDARINATES MANDIBULATED MANDIBULATES
MANSPREADING MARGINALISED MARGINALIZED MARISCHALLED MARIVAUDAGES
MASQUERADING MATERIALISED MATERIALIZED MATHEMATISED MATHEMATIZED
MATRICULATED MEDIAEVALISM MEDIAEVALIST MEDICAMENTAL MEGALOCARDIA
MELODRAMATIC METASTASISED METASTASIZED METHANAMIDES MICROMANAGED
MISALLOCATED MISCATALOGED MISDEMEANANT MISEVALUATED MULTIWARHEAD
MURDERABILIA NAPHTHALISED NAPHTHALIZED NATIONALISED NATIONALIZED
NEOPAGANISED NEOPAGANIZED NIACINAMIDES NONACADEMICS NONACTIVATED
NONCANDIDATE NORADRENALIN OUTBARGAINED OVERDRAMATIC PACHYDERMIAS
PAEDERASTIES PAEDIATRISTS PAEDOBAPTISM PAEDOBAPTIST PAEDOLOGICAL
PAEDOPHILIAC PAEDOPHILIAS PANDAEMONIUM PANDEMONIANS PARADOXURINE
PARALLELISED PARALLELIZED PARAMEDICALS PARAMETRISED PARAMETRIZED
PARAPERIODIC PARASCENDING PARASITICIDE PARASPHENOID PARASUICIDES
PARFOCALISED PARFOCALIZED PARTICIPATED PASQUINADERS PEDANTICALLY
PEDIATRICIAN PEDICELLARIA PLANTIGRADES PREVARICATED PROPAGANDISE
PROPAGANDIZE PTERIDOMANIA QUADRAPLEGIA QUADRAPLEGIC QUADRATRICES
QUADRATRIXES QUADRENNIALS QUADRIENNIAL QUADRIPLEGIA QUADRIVALENT
RADICALITIES RADIESTHESIA RADIOGRAPHED RADIOGRAPHER RADIOLABELED
RADIOTHERAPY RADIOTRACERS RATIOCINATED RATIONALISED RATIONALIZED
REACCLIMATED REACQUAINTED READAPTATION READMITTANCE RECALIBRATED
REINCARNATED REMAINDERMAN RERADIATIONS RETARDANCIES RETARDATIONS
REVACCINATED REVALIDATING REVALIDATION RIJKSDAALERS SACCHARIFIED
SAFEGUARDING SAILBOARDERS SALAMANDRINE SALICYLAMIDE SALMAGUNDIES
SANCTUARISED SANCTUARIZED SANDPAPERIER SANDPAPERING SAPINDACEOUS
SCANDALISERS SCANDALIZERS SCARABAEOIDS SEMIPALMATED SPEARHEADING
STANDARDISED STANDARDISER STANDARDISES STANDARDIZED STANDARDIZER
STANDARDIZES STENOCARDIAS SUBDIACONATE SULFADIAZINE SYLLABICATED
TARRADIDDLES TRADEMARKING TRADESCANTIA TRIANGULATED TRIRADIATELY
TRYPARSAMIDE UNACCLIMATED UNACQUAINTED UNAFFILIATED UNALLEVIATED
UNASSOCIATED UNBARRICADED UNBARRICADES UNCALIBRATED UNCAPTIVATED
UNDRAMATISED UNDRAMATIZED UNHABITUATED UNIRRADIATED UNMAINTAINED
UNVACCINATED UNVARIEGATED VAGABONDISED VAGABONDISES VAGABONDIZED
VAGABONDIZES VALETUDINARY VASCULARISED VASCULARIZED VAUDEVILLEAN
VAUDEVILLIAN VOCABULARIED WAKEBOARDING WALDGRAVINES WALLYDRAIGLE
WITHDRAWABLE ZANTEDESCHIA