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