There are 484 twelve-letter words containing A, D, I and 2N, https://www.bestwordlist.com/c/a/5/12letterwordswithadinn.htm
ABSENTMINDED ADMINISTRANT ADMONISHMENT ADVENTURINGS AGGRANDISING
AGGRANDIZING ALEXANDRINES AMMUNITIONED ANDROCENTRIC ANDROCLINIUM
ANDROGENESIS ANDROGENETIC ANODISATIONS ANODIZATIONS ANTEDILUVIAN
ANTEMERIDIAN ANTEPENDIUMS ANTEPRANDIAL ANTIANDROGEN ANTIDANDRUFF
ANTIDILUTION ANTIDUMPINGS ANTIHYDROGEN ANTIOXIDANTS ANTISPENDING
APPREHENDING ASCENDANCIES ASCENDENCIES ASTOUNDINGLY ATTENDANCIES
BALLHANDLING BANDEIRANTES BANDICOOTING BASTINADOING BLANDISHMENT
BONDMANSHIPS BREADWINNERS BREADWINNING BREAKDANCING CALENDERINGS
CANDIDNESSES CANNABIDIOLS CANNABINOIDS CANNIBALISED CANNIBALIZED
CANTHARIDIAN CANTHARIDINS CARBONADOING CHANDLERINGS CHONDROSTIAN
CLINDAMYCINS COADUNATIONS CODOMINANCES COGNOMINATED COINCIDENTAL
COMMANDINGLY COMMENDATION CONCERTINAED CONDEMNATION CONDENSATING
CONDENSATION CONDITIONALS CONDITIONATE CONDONATIONS CONDUCTIONAL
CONFIDENTIAL CONSIDERANCE CONTAMINATED COORDINANCES COORDINATING
COORDINATION CORNBRAIDING CORNBRANDIES CROSSBANDING CYANIDATIONS
CYANOHYDRINS DAINTINESSES DAMASCEENING DAMASCENINGS DAMASKEENING
DAMASQUINING DARINGNESSES DARRAIGNMENT DAUNORUBICIN DEAMINATIONS
DEBONAIRNESS DECANTATIONS DECLENSIONAL DECLINATIONS DEFINITIONAL
DEGARNISHING DEGENERATING DEGENERATION DEHUMANISING DEHUMANIZING
DEINDEXATION DEIONISATION DEIONIZATION DELAMINATING DELAMINATION
DELINEATIONS DEMIMONDAINE DEMONIANISMS DEMONISATION DEMONIZATION
DEMONOMANIAS DENATURATION DENATURISING DENATURIZING DENERVATIONS
DENIGRATIONS DENITRATIONS DENOMINATING DENOMINATION DENOMINATIVE
DENOMINATORS DENTILINGUAL DENUNCIATING DENUNCIATION DENUNCIATIVE
DENUNCIATORS DENUNCIATORY DEPENDANCIES DERACINATING DERACINATION
DERAIGNMENTS DERMAPLANING DESALINATING DESALINATION DESALINISING
DESALINIZING DESCENSIONAL DESIGNATIONS DESTINATIONS DETERMINANTS
DETRAINMENTS DETRUNCATING DETRUNCATION DIBENZOFURAN DIENCEPHALON
DIFUNCTIONAL DIPRIONIDIAN DISADVANCING DISANCHORING DISANIMATING
DISANNULLERS DISANNULLING DISANNULMENT DISANOINTING DISARRANGING
DISAVAUNCING DISBANDMENTS DISBRANCHING DISCANDERING DISCANDYINGS
DISCIPLINANT DISCRIMINANT DISENCHAINED DISENCHANTED DISENCHANTER
DISENSLAVING DISENTAILING DISENTANGLED DISENTANGLES DISENTRAINED
DISENTRANCED DISENTRANCES DISIMAGINING DISINFECTANT DISINFESTANT
DISINFLATION DISMANTLINGS DISPENSATION DISSONANCIES DISTRAINMENT
DIVINISATION DIVINIZATION DOCTRINARIAN DODECAGYNIAN DOMINATINGLY
DOWNLOADINGS DRACONIANISM DRAGONNADING DRAWLINGNESS DUNNIEWASSAL
DUODECENNIAL DYNAMOGENIES EDUTAINMENTS ENCARNALISED ENCARNALIZED
ENDEAVOURING ENDORSATIONS ENFRANCHISED ENGARLANDING ENGARRISONED
ENTERDEALING FARTHINGLAND FAULTFINDING FECUNDATIONS FORWANDERING
FOUNDATIONAL FOUNDATIONER FOUNTAINHEAD FREESTANDING FUNCTIONATED
FUNDRAISINGS GANGLIONATED GOALTENDINGS GONADOTROPIN GORMANDISING
GORMANDIZING GUANETHIDINE HANDBAGGINGS HANDCRAFTING HANDFASTINGS
HANDICAPPING HANDSHAKINGS HANDSTAMPING HANDWRINGERS HANDWRITINGS
HANSARDISING HANSARDIZING HARDSTANDING HEADBANGINGS HEADHUNTINGS
HEARTRENDING HYDRASTININE HYDROPLANING INADAPTATION INADVERTENCE
INADVERTENCY INCANDESCENT INCANDESCING INCARDINATED INCARDINATES
INCARNADINED INCARNADINES INCENDIARIES INCENDIARISM INCIDENTALLY
INCOMUNICADO INCOORDINATE INCRIMINATED INDECLINABLE INDECLINABLY
INDEFINABLES INDENTATIONS INDICATIONAL INDIGNATIONS INDOCTRINATE
INDOMETACINS INDOMETHACIN INDORSATIONS INFANTICIDAL INFANTICIDES
INFANTILISED INFANTILIZED INFEUDATIONS INFLATEDNESS INFUNDIBULAR
INORDINACIES INORDINATELY INORDINATION INSTANTIATED INTENDANCIES
INTERCHAINED INTERCHANGED INTERDASHING INTERDEALING INTERGRADING
INTERLARDING INTERMUNDANE INTERNALISED INTERNALIZED INTERPLANTED
INTERSTRANDS INTERTANGLED INTIMIDATING INTIMIDATION INTRAMUNDANE
INVALIDATING INVALIDATION INWARDNESSES KINDERGARTEN KNEEBOARDING
LANDBOARDING LANDFILLINGS LANDGRAVINES LANDHOLDINGS LANDSCAPINGS
LANDSKIPPING LONGITUDINAL MAIDENLINESS MAINTENANCED MANDARINATES
MANDARINISMS MANDOLINISTS MANDUCATIONS MANIFOLDNESS MANSPREADING
MEANDERINGLY MEDALLIONING MENDICANCIES MIDAFTERNOON MISCHANNELED
MISDEMEANANT MISDEMEANING MISHANDLINGS MONOCARDIANS MONODELPHIAN
MOUNTAINSIDE NATIONALISED NATIONALIZED NEONATICIDES NEOPAGANISED
NEOPAGANIZED NIACINAMIDES NICOTINAMIDE NIDIFICATING NIDIFICATION
NOMADISATION NOMADIZATION NONACADEMICS NONACTIVATED NONADDICTIVE
NONADDITIVES NONADIABATIC NONADMISSION NONCANDIDACY NONCANDIDATE
NONCUSTODIAL NONDEMANDING NONDIABETICS NONEDITORIAL NONEDUCATION
NONIDENTICAL NONIRRIGATED NONLADDERING NONRAILROADS NONSTEROIDAL
NORADRENALIN NULLIFIDIANS NURSEMAIDING OLEANDOMYCIN ONEIRODYNIAS
ORDINARINESS OVERDOMINANT OVERHANDLING OVERSTANDING PANDAEMONIUM
PANDEMONIANS PANDEMONIUMS PARASCENDING PASQUINADING PATHFINDINGS
PENINSULATED PENTACRINOID PENTAMIDINES PENTLANDITES PHILANDERING
PHYTONADIONE PINNATIFIDLY PINNIPEDIANS PONDERANCIES PONDERATIONS
PREDOMINANCE PREDOMINANCY PREHARDENING PRENOMINATED PREORDAINING
PREORDINANCE PUMPHANDLING PYCNOCONIDIA QUADRENNIALS QUADRENNIUMS
QUADRIENNIAL QUADRIENNIUM QUINDECAGONS QUINQUENNIAD RANCIDNESSES
RANGEFINDERS RANGEFINDING REDUNDANCIES REFOUNDATION REINCARNATED
REINNERVATED RELAUNDERING REMAINDERING REMAINDERMAN REMAINDERMEN
REORDINATION REPRIMANDING RESPONDENTIA ROPEDANCINGS SALAMANDRIAN
SALAMANDRINE SANDBLASTING SANDPAINTING SANDPAPERING SCANDALISING
SCANDALIZING SCINCOIDIANS SEMIDOMINANT SINDONOPHANY SNOWBLADINGS
SNOWBOARDING SQUANDERINGS STEPDANCINGS SUBDOMINANTS SUBORDINANCY
SYNDICATIONS TENDENCIALLY TENDENTIALLY TENDINOPATHY TRAGEDIENNES
TRANSCENDING TRANSDUCTION TRANSITIONED TRANSUDATION TYRANNICIDAL
TYRANNICIDES UNACQUAINTED UNADMONISHED UNASCENDIBLE UNBIASEDNESS
UNCANDIDNESS UNDERACTIONS UNDERBEARING UNDERCOATING UNDERDRAINED
UNDERDRAWING UNDERHANDING UNDERHEATING UNDERLAPPING UNDERLEASING
UNDERLOADING UNDERMANNING UNDERMEANING UNDERPASSION UNDERPLAYING
UNDERSEALING UNDERSTATING UNDERTAKINGS UNDERVALUING UNDESIGNATED
UNDESPAIRING UNDISCORDANT UNDISMANTLED UNDRINKABLES UNDULATINGLY
UNFADINGNESS UNFRANCHISED UNGERMINATED UNINHABITEDS UNINOCULATED
UNINTEGRATED UNMAINTAINED UNMECHANISED UNMECHANIZED UNMYELINATED
UNNILQUADIUM UNORIGINATED UNPARADISING UNPATRONISED UNPATRONIZED
UNPAVILIONED UNQUANTIFIED UNRESTRAINED UNSANCTIFIED UNSANCTIONED
UNSEMINARIED UNSTEADINESS UNTERMINATED UNVACCINATED UNVANQUISHED
UNVENTILATED VACATIONLAND VENDITATIONS VINDEMIATING VINDICATIONS
VINYLCYANIDE WINDJAMMINGS WINDLOADINGS WITHSTANDING