There are 711 twelve-letter words containing A, E, I and 2O, https://www.bestwordlist.com/c/a/5/12letterwordswithaeioo.htm ABIOTROPHIES ACOLOUTHITES ACROPHONETIC AECIDIOSPORE AECIDOSPORES AEOLOTROPIES AERODONETICS AEROEMBOLISM AERONEUROSIS AEROSOLISING AEROSOLIZING AEROSTATIONS AEROTROPISMS AETHRIOSCOPE AETIOLOGICAL AETIOLOGISTS AGNOIOLOGIES AILOUROPHILE AILOUROPHOBE AILUROPHOBES ALVEOLATIONS AMBIOPHONIES AMELIORATION AMELIORATORS AMELIORATORY AMINOBENZOIC AMINOPHENOLS AMINOTOLUENE AMPHICOELOUS AMYOTROPHIES ANAEROBIONTS ANAEROBIOSES ANAEROBIOSIS ANAEROBIOTIC ANEMOPHILOUS ANEMOPHOBIAS ANGELOLOGIES ANGELOLOGIST ANISOTROPIES ANORTHOSITES ANTEPOSITION ANTHEROZOIDS ANTHEROZOOID ANTHOLOGISED ANTHOLOGISER ANTHOLOGISES ANTHOLOGIZED ANTHOLOGIZER ANTHOLOGIZES ANTIECONOMIC ANTIGROPELOS ANTIHORMONES APOGEOTROPIC APOLOGETICAL APOMORPHINES APOSTROPHISE APOSTROPHIZE APOTHEOSISED APOTHEOSISES APOTHEOSIZED APOTHEOSIZES APPORTIONERS ARCHEOLOGIES ARCHEOLOGIST ARISTOLOGIES ASTACOLOGIES ASTRONOMISED ASTRONOMISES ASTRONOMIZED ASTRONOMIZES ATHEOLOGICAL AUTECOLOGIES AUTOECIOUSLY AUTOEROTISMS AUTOINJECTOR AUTOTOXAEMIA AUTOTOXEMIAS AUTOTROPHIES AUXOTROPHIES AXONOMETRIES AZOOSPERMIAS BACKWOODSIER BACTERIOLOGY BALNEOLOGIES BALNEOLOGIST BAROPHORESIS BASIDIOSPORE BIOAERATIONS BIOGEOGRAPHY BIOMOLECULAR BLASTOCOELIC BLOODSTAINED BOOMERANGING BOROSILICATE BOTHERATIONS CACOTROPHIES CALYCOIDEOUS CAMPODEIFORM CARDIOLOGIES CARPHOLOGIES CATHOLICOSES CEPHALOPODIC CEREBROTONIA CHLOROACETIC CHOCOLATIERS CHOCOLATIEST CICHORACEOUS CLOISONNAGES CLOTRIMAZOLE COACERVATION COALITIONERS COCARCINOGEN COCHAIRWOMEN CODOMINANCES COEDUCATIONS COENAMOURING COENOBITICAL COGENERATION COGNOMINATED COGNOMINATES COHORTATIVES COLEORRHIZAE COLONIALISED COLONIALISES COLONIALIZED COLONIALIZES COLONIALNESS COMMENDATION COMMENTATION COMMISERATOR COMMONALTIES COMPANIONATE COMPASSIONED COMPELLATION COMPENSATION COMPLEXATION COMPLEXIONAL COMPONENTIAL CONCEPTIONAL CONCESSIONAL CONCOMITANCE CONCREMATION CONDEMNATION CONDENSATION CONDITIONATE CONFESSIONAL CONGELATIONS CONGREGATION CONNECTIONAL CONSCIONABLE CONSECRATION CONSERVATION CONSOLIDATED CONSOLIDATES CONSONANCIES CONTENTATION CONTESTATION CONTORNIATES CONVECTIONAL CONVENTIONAL CONVERSATION CONVERSIONAL COOPERATIONS COOPERATIVES COORDINANCES COORDINATELY COORDINATIVE COPROPHAGIES CORPORATISED CORPORATISES CORPORATIZED CORPORATIZES CORPOREALISE CORPOREALISM CORPOREALIST CORPOREALITY CORPOREALIZE CORRECTIONAL CORRELATIONS COSMOLATRIES CRANIOLOGIES CRANIOTOMIES CREOLISATION CREOLIZATION DECOLLATIONS DECOLORATING DECOLORATION DECORTICATOR DEFLORATIONS DEFOLIATIONS DEFORCIATION DEFORMATIONS DEHORTATIONS DEIONISATION DEIONIZATION DEMODULATION DEMONISATION DEMONIZATION DEMONOMANIAS DEMOTIVATION DENOMINATION DENOMINATORS DEOPPILATION DEOXIDATIONS DEPLORATIONS DEPOPULATION DEPORTATIONS DEPOSITATION DEPOSITIONAL DERMATOLOGIC DEROGATORILY DESPOLIATION DETOXICATION DEVOTIONALLY DIAGEOTROPIC DIALECTOLOGY DIATOMACEOUS DISCONSOLATE DISCORPORATE DISHONORABLE DISOPERATION DODECAPHONIC DOMESTICATOR DOULOCRACIES DOXOGRAPHIES ECCALEOBIONS ECHOLOCATING ECHOLOCATION ECOLOGICALLY ECONOMICALLY EDAPHOLOGIES EDULCORATION ELABORATIONS ELOCUTIONARY EMBOLISATION EMBOLIZATION EMBROCATIONS EMETOPHOBIAS EMOTIONALISE EMOTIONALISM EMOTIONALIST EMOTIONALITY EMOTIONALIZE ENANTIOMORPH ENANTIOTROPY ENDORSATIONS ENDOTHELIOMA ENVENOMATION ENZOOTICALLY EOSINOPHILIA EPANORTHOSIS EPANORTHOTIC EPISTOLATORY EPOXIDATIONS EQUIVOCATION EQUIVOCATORS EQUIVOCATORY EROTISATIONS EROTIZATIONS EROTOLOGICAL EROTOMANIACS EROTOPHOBIAS ESCAPOLOGIES ESCAPOLOGIST ESCHATOLOGIC ETHNOLOGICAL ETYMOLOGICAL EVAPORATIONS EVOLUTIONARY EXCOGITATION EXCOGITATORS EXCORIATIONS EXFOLIATIONS EXHORTATIONS EXONERATIONS EXPLOITATION EXPLORATIONS EXPORTATIONS EXPOSITIONAL EXPROBRATION EXPROPRIATOR EXTORTIONARY EXTORTIONATE FLAVOPROTEIN FOMENTATIONS FOOLHARDIEST FOOLHARDISES FOOLHARDIZES FOOTWEARIEST FOREORDAINED FORESTATIONS FOUNDATIONER FURAZOLIDONE GADZOOKERIES GAMETOPHORIC GASTROLOGIES GASTRONOMIES GASTROTOMIES GEMMOLOGICAL GEOBOTANICAL GEOBOTANISTS GEOGNOSTICAL GEOLOCATIONS GEOLOGICALLY GEOPOLITICAL GERATOLOGIES GERATOLOGIST GLACIOLOGIES GLOMERATIONS GONFALONIERS GRAMOPHONIES GRANODIORITE GRAPHOLOGIES GYNAECOLOGIC HAEMATOLOGIC HAEMOGLOBINS HAEMOPHOBIAS HAEMOPOIESES HAEMOPOIESIS HAEMOPOIETIC HAEMOPROTEIN HAEMORRHOIDS HALOGENATION HALOPERIDOLS HARMONIPHONE HELIOLATROUS HEMATOLOGIES HEMATOLOGIST HEMORRHOIDAL HEPATICOLOGY HEPATOLOGIES HEPATOLOGIST HEROICOMICAL HETEROOUSIAN HETEROSOCIAL HETEROTOPIAS HEXACOSANOIC HIEROLOGICAL HIEROPHOBIAS HOLOGRAPHIES HOLOPARASITE HOMEOPATHIES HOMEOPATHIST HOMEOTYPICAL HOMOBLASTIES HOMOEOPATHIC HOMOEOSTASIS HOMOEOSTATIC HOMOGRAPHIES HOMOPLASMIES HOMOPLASTIES HOMOTHALLIES HOOTANANNIES HOOTENANNIES HOROGRAPHIES HOROMETRICAL HYPOVOLAEMIC ICONOGRAPHER ICONOLATRIES ICONOMACHIES ICOSAHEDRONS IMMODERATION IMPERSONATOR INCONSOLABLE INCONSONANCE INCOORDINATE INCORPORABLE INCORPORATED INCORPORATES INTERPOLATOR INTERROGATOR INTOLERATION IODOMETRICAL ISOMETROPIAS KALEIDOPHONE KALEIDOSCOPE KERATOTOMIES KETOACIDOSES KETOACIDOSIS KILOCALORIES LABORATORIES LACTOPROTEIN LAMPOONERIES LAPAROTOMIES LEPTOSOMATIC LIMACOLOGIES LOADSAMONIES LOGANIACEOUS LOGODAEDALIC LOGOGRAPHIES LORDOLATRIES MALACOLOGIES MASTIGOPHORE MELANOCHROIC MELANOTROPIN MELIORATIONS MEMORISATION MEMORIZATION MEREOLOGICAL MESOTHELIOMA MESOTHORACIC METABOLOMICS METABOTROPIC METROLOGICAL METRONOMICAL METROPOLITAN MIDAFTERNOON MOLESTATIONS MONADOLOGIES MONETISATION MONETIZATION MONODELPHIAN MONOFILAMENT MONOGRAPHIES MONOMETALLIC MONOMETRICAL MORIGERATION MOUSTACHIOED MUSEOLOGICAL NAPOLEONITES NECROLOGICAL NECROPHOBIAS NEGOTIATIONS NEGROPHOBIAS NEMATOLOGIES NEMATOLOGIST NEOANTHROPIC NEOLOGICALLY NEONOMIANISM NEPHOLOGICAL NEUROFIBROMA NEUROLOGICAL NOMOGRAPHIES NOMOTHETICAL NONCOLLINEAR NONCOMBATIVE NONEDITORIAL NONEDUCATION NONEMOTIONAL NONNORMATIVE NONOPERATING NONOPERATIVE NONSTEROIDAL NONVOLATILES NORMOTHERMIA NOSOGRAPHIES NOSTOPATHIES NOTICEBOARDS NOVELISATION NOVELIZATION OBLITERATION OBLITERATORS OBSECRATIONS OBSERVATIONS OBTESTATIONS OCEANOLOGIES OCEANOLOGIST OCHLOCRACIES OCTAPLOIDIES OCTOGENARIAN OCTOGENARIES OESOPHAGITIS OLEAGINOUSLY OLEANDOMYCIN OLEOGRAPHIES OLEOMARGARIN OLIGOCHAETES OLIGOPHAGIES OLIGOSPERMIA ONEIRODYNIAS ONEIROMANCER ONOMATOPOEIA ONOMATOPOEIC OPERATIONISM OPERATIONIST OPHIOLATRIES OPINIONATELY OPINIONATIVE OPOTHERAPIES OPPIGNORATED OPPIGNORATES OPTOMETRICAL ORCHIDACEOUS OREOGRAPHIES ORGANOGENIES ORGANOLEPTIC ORGANOLOGIES ORICHALCEOUS ORIENTATIONS OROGENICALLY ORTHOPAEDICS ORTHOPAEDIES ORTHOPAEDIST ORTHOPEDICAL ORTHOPRAXIES OSCULATORIES OSMOLALITIES OSMOLARITIES OSTENTATIONS OSTENTATIOUS OSTEOBLASTIC OSTEOCLASTIC OSTEOLOGICAL OSTEOMALACIA OSTEOMALACIC OSTEOPATHIES OSTEOPATHIST OSTEOPLASTIC OUTORGANISED OUTORGANISES OUTORGANIZED OUTORGANIZES OUTPASSIONED OUTREASONING OVARIOTOMIES OVERCANOPIED OVERCANOPIES OVERCAUTIONS OVERCAUTIOUS OVERCOACHING OVERCOATINGS OVERDIAGNOSE OVERDOMINANT OVERFAVORING OVERLABORING OVERORGANISE OVERORGANIZE OVERREACTION OVERROASTING OVERTAXATION OXYGENATIONS PAEDODONTICS PAEDOLOGICAL PAEDOLOGISTS PAEDOMORPHIC PALAEBIOLOGY PALAEOLOGIES PALEOBIOLOGY PALEOBOTANIC PALYNOLOGIES PAPYROLOGIES PARLEYVOOING PAROEMIOLOGY PARONOMASIES PARTICOLORED PATHOGNOMIES PATHOLOGISED PATHOLOGISES PATHOLOGIZED PATHOLOGIZES PERCOLATIONS PERFOLIATION PERFORATIONS PERINATOLOGY PERIODONTIAS PERNOCTATION PERORATIONAL PEROXIDATION PERSONATIONS PESTOLOGICAL PETROLOGICAL PHAENOLOGIES PHENGOPHOBIA PHENOLOGICAL PHOTOELASTIC PHOTOGELATIN PHOTOMACHINE PHOTONASTIES PHOTOREALISM PHOTOREALIST PHRASEOLOGIC PHYTONADIONE PLAGIOSTOMES PLEROPHORIAS POLARISCOPES POLYSILOXANE PONDERATIONS PORCELAINOUS PORNOCRACIES POSSESSIONAL POTAMOLOGIES POTENTIATION POTENTIATORS POWERBOATING PRAXEOLOGIES PRAXINOSCOPE PRECOLONIALS PREDOMINATOR PREFLORATION PREFOLIATION PREFORMATION PROBATIONERS PROBOSCIDEAN PROCESSIONAL PROCREATIONS PROFESSIONAL PROFESSORIAL PROFESSORIAT PROJECTIONAL PROOFREADING PROPANEDIOIC PROSECTORIAL PROSOPOPEIAL PROSOPOPEIAS PROSOPOPOEIA PROTECTORIAL PROTESTATION PROTOPATHIES PROTOTHERIAN PROVOCATIVES PSEUDOLOGIAS PSEUDOPODIAL PUFTALOONIES RACHIOTOMIES RADIOECOLOGY RADIOIODINES RADIOISOTOPE RADIOPHONIES RADIOSCOPIES REABSORPTION REALLOCATION REAPPORTIONS RECIPROCATOR RECORDATIONS REDECORATION REFORMATIONS REFOUNDATION REMOTIVATION RENOMINATION REOCCUPATION REOPERATIONS REORDINATION REOXIDATIONS REPOPULATION REPROBATIONS RESPONSORIAL RESTORATIONS RETINOSPORAS RETROACTIONS REVOLUTIONAL RHINORRHOEAL RHINORRHOEAS RHYTHMOPOEIA ROADWORTHIER ROADWORTHIES SATANOLOGIES SCOPOLAMINES SCORPAENOIDS SEMATOLOGIES SEMICOLONIAL SEMICOMATOSE SEMIOLOGICAL SERIOCOMICAL SIALORRHOEAS SNOBOCRACIES SOAPOLALLIES SOCIOPATHIES SOLENOIDALLY SOMATOLOGIES SOMATOMEDINS SOMATOTENSIC SONOGRAPHIES SPERMATOZOIC SPERMATOZOID SPODOMANCIES SPORANGIOLES STRABOTOMIES STROMATOLITE STROPHIOLATE TAUTOLOGISED TAUTOLOGISES TAUTOLOGIZED TAUTOLOGIZES TAUTOPHONIES TECHNOPHOBIA TELEOLOGICAL TERATOLOGIES TERATOLOGIST TERATOPHOBIA THEOPHOBIACS THEORISATION THEORIZATION THEOSOPHICAL TOMOGRAPHIES TOPOGRAPHIES TORREFACTION TOXOCARIASES TRICORPORATE TRIFOLIOLATE UNAPOLOGETIC UNECOLOGICAL UNECONOMICAL UNIFOLIOLATE URBANOLOGIES VAPOROSITIES VARICOLOURED VARICOTOMIES VELOCIRAPTOR VINEGARROONS VISCEROTONIA VOCIFERATION VOCIFERATORS VOWELISATION VOWELIZATION WOLLASTONITE XENOGLOSSIAS ZOANTHROPIES ZOOMAGNETISM ZOOSPERMATIC ZOOTECHNICAL ZOOTHERAPIES