There are 489 twelve-letter words containing A, C, D and 2I, https://www.bestwordlist.com/c/a/5/12letterwordswithacdii.htm
ACADEMICIANS ACADEMICISMS ACARIDOMATIA ACCLIMATISED ACCLIMATIZED
ACCORDIONIST ACETANILIDES ACIDIMETRIES ACIDOPHILOUS ACIDULATIONS
ADJUDICATING ADJUDICATION ADJUDICATIVE ADMINICULATE ADSCITITIOUS
ADSCRIPTIONS AECIDIOSPORE AEROMEDICINE AFFICIONADOS ANDROCLINIUM
ANTIACADEMIC ANTIDIABETIC ANTIDIURETIC ANTIDOGMATIC ANTIPERIODIC
APERIODICITY APHRODISIACS APODEICTICAL APPENDICITIS AUDIOLOGICAL
AUTODIDACTIC BACILLICIDES BACKSLIDINGS BACTERICIDAL BACTERICIDES
BACTERIOCIDE BANDICOOTING BARRICADOING BASIDIOCARPS BENEFICIATED
BICUSPIDATES BIODYNAMICAL BIOIDENTICAL BIQUADRATICS BIRDWATCHING
BLACKBIRDING CAESALPINOID CANISTERISED CANISTERIZED CANNABIDIOLS
CANNABINOIDS CANNIBALISED CANNIBALIZED CANTHARIDIAN CANTHARIDINS
CARBAMIDINES CARDINALSHIP CARDIOLOGIES CARDIOLOGIST CARDIOPLEGIA
CARDIOTONICS CATADIOPTRIC CATHIODERMIE CATHOLICISED CATHOLICIZED
CAUDILLISMOS CERTIFICATED CHILDBEARING CHILIAHEDRON CHLORIDATING
CIRCULARISED CIRCULARIZED CIVILIANISED CIVILIANIZED CLAIRAUDIENT
CLAUDICATION CLINDAMYCINS COADMINISTER COCCIDIOSTAT CODIFICATION
COINCIDENTAL COLLOIDALITY COLONIALISED COLONIALIZED COLOQUINTIDA
COMPACTIFIED CONDITIONALS CONDITIONATE CONFIDENTIAL COORDINATING
COORDINATION COORDINATIVE CORDIALISING CORDIALITIES CORDIALIZING
CORNBRAIDING CRIMINALISED CRIMINALIZED CROCODILIANS CUSPIDATIONS
CYANIDATIONS DAUNORUBICIN DEACIDIFYING DEACTIVATING DEACTIVATION
DECALCIFIERS DECALCIFYING DECAPITALISE DECAPITALIZE DECAPITATING
DECAPITATION DECIDABILITY DECIMALISING DECIMALIZING DECLASSIFIED
DECLASSIFIES DECLINATIONS DECRASSIFIED DECRASSIFIES DEDICATIONAL
DEDICATORIAL DEFORCIATION DEGLACIATION DEIFICATIONS DELOCALISING
DELOCALIZING DEMONIACISMS DENUNCIATING DENUNCIATION DENUNCIATIVE
DEPRECIATING DEPRECIATION DEPRECIATIVE DERACIALISED DERACIALISES
DERACIALIZED DERACIALIZES DERACINATING DERACINATION DESANCTIFIED
DESANCTIFIES DESICCATIONS DESICCATIVES DETOXICATING DETOXICATION
DEVOCALISING DEVOCALIZING DIABETOGENIC DIABOLICALLY DIACHRONISMS
DIAGEOTROPIC DIAGNOSTICAL DIAGRAMMATIC DIALECTICIAN DIALECTICISM
DIALOGICALLY DIALYTICALLY DIAPHORETICS DIASCORDIUMS DIATONICALLY
DIATONICISMS DIBASICITIES DIBRANCHIATE DICARBOXYLIC DICEPHALISMS
DICHOTICALLY DICHROMATICS DICHROMATISM DICTATORSHIP DICTIONARIES
DIDACTICALLY DIDACTICISMS DIDACTYLISMS DIENCEPHALIC DIETETICALLY
DIFFRACTIONS DIFUNCTIONAL DIJUDICATING DIJUDICATION DILACERATING
DILACERATION DILATOMETRIC DILUCIDATING DILUCIDATION DIOPTRICALLY
DIPLOBLASTIC DIPLOCARDIAC DIPLOMATICAL DIPSOMANIACS DISACCHARIDE
DISACCHARIDS DISACCORDING DISACCREDITS DISADVANCING DISAFFECTING
DISAFFECTION DISANCHORING DISASSOCIATE DISAVAUNCING DISAVOUCHING
DISBRANCHING DISCANDERING DISCANDYINGS DISCEPTATION DISCIPLINANT
DISCIPLINARY DISCLAMATION DISCOGRAPHIC DISCOURAGING DISCRETIONAL
DISCRIMINANT DISCRIMINATE DISCULPATING DISCUSSIONAL DISENCHAINED
DISFRANCHISE DISINFECTANT DISINTRICATE DISLOCATIONS DISPRIVACIED
DISSOCIALISE DISSOCIALITY DISSOCIALIZE DISSOCIATING DISSOCIATION
DISSOCIATIVE DISSONANCIES DISTRACTIBLE DISTRACTIONS DITHEISTICAL
DITHELETICAL DITTOGRAPHIC DIURETICALLY DIVARICATELY DIVARICATING
DIVARICATION DIVARICATORS DIVELLICATED DIVELLICATES DIVERTICULAR
DOCKISATIONS DOCKIZATIONS DOCTRINAIRES DOCTRINALITY DOCTRINARIAN
DOCTRINARISM DOMICILIATED DOMICILIATES DOMINATRICES DONATISTICAL
DOPAMINERGIC DRACONIANISM DRACONTIASIS DRAMATICISMS DUPLICATIONS
DYNASTICISMS EDIFICATIONS EDUCATIONIST ELUCIDATIONS ENDOCARDITIC
ENDOCARDITIS EPICYCLOIDAL EPIDEICTICAL EPIDEMICALLY EPIDIASCOPES
EPISODICALLY EQUIDISTANCE ERADICATIONS FEDERALISTIC FERRICYANIDE
FLACCIDITIES FRACTIONISED FRACTIONIZED FUNGICIDALLY GENOCIDAIRES
GIGANTICIDES GILRAVITCHED GRADUALISTIC HANDICAPPING HELICOIDALLY
HERBICIDALLY HIERARCHISED HIERARCHIZED HISPANICISED HISPANICIZED
HYPERACIDITY IDIOSYNCRASY IMMETHODICAL IMMODERACIES INADEQUACIES
INCANDESCING INCARDINATED INCARDINATES INCARNADINED INCARNADINES
INCENDIARIES INCENDIARISM INCIDENTALLY INCOMUNICADO INCOORDINATE
INCRIMINATED INDECLINABLE INDECLINABLY INDELICACIES INDELICATELY
INDICATIONAL INDICATIVELY INDOCTRINATE INDOLEACETIC INDOMETACINS
INDOMETHACIN INDUPLICATED INERADICABLE INERADICABLY INEXACTITUDE
INFANTICIDAL INFANTICIDES INJUDICIALLY INORDINACIES INSECTICIDAL
INTENDANCIES INTERCHAINED INTERDIALECT INTERMEDIACY INTRACARDIAC
INTRACARDIAL IODOMETRICAL IRACUNDITIES IRRADIANCIES IRRADICATING
ISODIAMETRIC JUDICATORIAL JUDICATORIES KETOACIDOSIS KITCHENMAIDS
LAPIDICOLOUS LIBERTICIDAL MACADAMISING MACADAMIZING MADREPORITIC
MALEDICTIONS MASCULINISED MASCULINIZED MEDICALISING MEDICALIZING
MEDIOCRACIES MENDICANCIES METAPERIODIC MICROBICIDAL MISCAPTIONED
MISEDUCATING MISEDUCATION MISGUIDANCES MITOCHONDRIA MODIFICATION
MODIFICATIVE MODIFICATORY MULTIPLICAND NEONATICIDES NIACINAMIDES
NICOTINAMIDE NIDIFICATING NIDIFICATION NONADDICTIVE NONADIABATIC
NONDIABETICS NONIDENTICAL OCTAPLOIDIES OFFICIALDOMS ORCHIDOMANIA
PAEDOPHILIAC PAEDOPHILICS PARADIGMATIC PARADISAICAL PARADISIACAL
PARAPERIODIC PARASITICIDE PARASUICIDES PARTICIPATED PECULIARISED
PECULIARIZED PEDANTICISED PEDANTICISES PEDANTICISMS PEDANTICIZED
PEDANTICIZES PEDIATRICIAN PEDICELLARIA PEDICULATION PEDOPHILIACS
PENTACRINOID PERACIDITIES PERICARDITIC PERICARDITIS PERICARDIUMS
PERICHONDRIA PERICLITATED PERIODICALLY PHOSPHATIDIC PHYSICALIZED
PICCADILLIES PICCADILLOES PICKADILLIES PICKADILLOES PONTIFICATED
PRECIPITATED PREDIABETICS PREDICATIONS PROBOSCIDIAN PROPANEDIOIC
PYCNOCONIDIA QUADRIPHONIC QUADRIPLEGIC RADICALISING RADICALISTIC
RADICALITIES RADICALIZING RADICICOLOUS RADICIVOROUS RADIESTHETIC
RADIOCHEMIST RADIOGRAPHIC RADIOLOGICAL RADIOMIMETIC RADIONUCLIDE
RADIOPHONICS RADIOSCOPIES RATIOCINATED RECLASSIFIED RECRIMINATED
REDEDICATING REDEDICATION RESOCIALISED RESOCIALIZED REVINDICATED
REVINDICATES RHAPSODISTIC ROMANTICISED ROMANTICIZED SACCHARIFIED
SADISTICALLY SALICYLAMIDE SANCTIFIEDLY SARDONICISMS SCABRIDITIES
SCANDALISING SCANDALIZING SCHISMATISED SCHISMATIZED SCINCOIDIANS
SCINTILLATED SEPTICIDALLY SIDEROSTATIC SIDETRACKING SOLIDARISTIC
SPECIFICATED SPIFFLICATED SUBACIDITIES SUBINDICATED SUBINDICATES
SYNDICALISMS SYNDICALISTS SYNDICATIONS SYNDIOTACTIC THEATRICISED
THEATRICIZED TRACHEITIDES TRADUCIANISM TRADUCIANIST TREPIDACIOUS
TRICUSPIDATE TROPICALISED TROPICALIZED TYRANNICIDAL TYRANNICIDES
UNCLASSIFIED UNDIPLOMATIC UNIDEALISTIC UNSANCTIFIED UNSOCIALISED
UNSOCIALIZED VALEDICTIONS VASCULITIDES VELOCIPEDIAN VERIDICALITY
VINDICATIONS VINDICATRESS VINYLCYANIDE WILDCATTINGS