There are 463 twelve-letter words containing A, C, E, L and Y, https://www.bestwordlist.com/c/a/5/12letterwordswithacely.htm
ABSTRACTEDLY ACADEMICALLY ACCELERATORY ACCENTUALITY ACCIDENTALLY
ACCUSATIVELY ACETALDEHYDE ACETYLATIONS ACHLAMYDEOUS ACROGENOUSLY
ADJECTIVALLY ADJUNCTIVELY ADOLESCENTLY AFFLICTIVELY AGRANULOCYTE
ALCHEMICALLY ALKALESCENCY ALLYCHOLLIES ALYCOMPAINES AMYLOPECTINS
ANELASTICITY ANTECEDENTLY ANTICYCLONES ARCHETYPALLY ARCHETYPICAL
ARTICULATELY ASTRICTIVELY ASYMMETRICAL ATHLETICALLY ATTRACTIVELY
AURICULATELY AUTOCATALYSE AUTOCATALYZE AUTOECIOUSLY BACKHANDEDLY
BACTERIOLOGY BALLETICALLY BATHETICALLY BATHYPELAGIC BEATIFICALLY
BELLYACHINGS BENEFICIALLY BICARPELLARY BIOCATALYSES BLASTOCHYLES
BONNYCLABBER BRACHYCEPHAL BRACHYLOGIES CADAVEROUSLY CAESPITOSELY
CALCAREOUSLY CALCULATEDLY CALYCANTHEMY CALYCOIDEOUS CALYPTROGENS
CANDESCENTLY CANDYFLOSSES CAPACITIVELY CARBONYLATED CARBONYLATES
CARBOXYLASES CARBOXYLATED CARBOXYLATES CARBYLAMINES CARDIOMEGALY
CATEGORIALLY CELEBREALITY CENTENNIALLY CENTESIMALLY CEPHALICALLY
CEPHALOMETRY CEREMONIALLY CHALCOPYRITE CHANGELESSLY CHASTENINGLY
CHERUBICALLY CHESSPLAYERS CHIMERICALLY CHLORENCHYMA CHOLERICALLY
CLAIRVOYANCE CLAPTRAPPERY CLATTERINGLY CLEANABILITY CLEAVABILITY
COETANEOUSLY COGITATIVELY COLLATERALLY COLLEGIALITY COLLEGIATELY
COLLENCHYMAS COLLINEARITY COMMENSALITY COMMERCIALLY COMPLACENTLY
CONCEALINGLY CONCEPTUALLY CONGENIALITY CONGENITALLY CONSENSUALLY
CONSIDERABLY CONSUMMATELY CONTEXTUALLY CONTRACTEDLY CONTUBERNYAL
CONVENTUALLY CONVERSANTLY COORDINATELY COPULATIVELY CORPOREALITY
COSMETICALLY COTYLEDONARY COUNTERPLAYS COUNTERRALLY COURAGEOUSLY
COVENANTALLY CRETACEOUSLY CRYSTALISERS CRYSTALIZERS CRYSTALLINES
CRYSTALLISED CRYSTALLISER CRYSTALLISES CRYSTALLITES CRYSTALLIZED
CRYSTALLIZER CRYSTALLIZES CUMULATIVELY CURVACEOUSLY CYBERATHLETE
CYBERNETICAL CYBERSTALKER CYCLANDELATE CYCLAZOCINES CYCLOALKANES
CYCLOHEXANES CYCLOPAEDIAS CYCLOPAEDIST CYCLOPENTANE CYCLOPLEGIAS
CYCLOPROPANE CYCLOSTOMATE CYTOCHEMICAL CYTOSKELETAL DECALCIFYING
DECASYLLABIC DECASYLLABLE DECIDABILITY DECORATIVELY DECREASINGLY
DEMONIACALLY DESPOTICALLY DETRACTINGLY DETRACTIVELY DIALECTOLOGY
DICARPELLARY DIETETICALLY DISCREPANTLY DISLOCATEDLY DISTRACTEDLY
DIURETICALLY DIVARICATELY DODECASTYLES DOMESTICALLY DUODECIMALLY
ECLECTICALLY ECLIPTICALLY ECOLOGICALLY ECONOMICALLY ECOTYPICALLY
ECSTATICALLY ECUMENICALLY EFFECTUALITY EGOISTICALLY ELECTABILITY
ELECTORIALLY ELECTRICALLY ELLIPTICALLY ELOCUTIONARY EMASCULATORY
EMPATHICALLY EMPHATICALLY ENCHANTINGLY ENCLITICALLY ENCYCLOPEDIA
ENTRANCINGLY ENTROPICALLY ENZOOTICALLY EPICYCLOIDAL EPIDEMICALLY
EPISODICALLY EQUIVOCALITY ESOTERICALLY ESTHETICALLY ETYMOLOGICAL
EUCALYPTOLES EUCALYPTUSES EUPHONICALLY EUPHORICALLY EURHYTHMICAL
EUSTATICALLY EVANESCENTLY EXCHANGEABLY EXCITABILITY EXCLUSIONARY
EXECRATIVELY EXEGETICALLY EXOTERICALLY EXTRACTIVELY FAIRNYTICKLE
FAIRNYTICLES FASCINATEDLY FLAMBOYANCES FORENSICALLY FRENETICALLY
GALACTOMETRY GENICULATELY GEODETICALLY GEODYNAMICAL GEOLOGICALLY
GEOSYNCLINAL GLYCERINATED GLYCERINATES GLYCOSIDASES GLYCOSYLATED
GLYCOSYLATES GLYPTOTHECAE GRANULOCYTES GYNAECOLOGIC HAEMATOCRYAL
HAEMATOXYLIC HELICOIDALLY HELLACIOUSLY HEPATICOLOGY HERALDICALLY
HERBACEOUSLY HERBICIDALLY HERMETICALLY HERMITICALLY HETERODACTYL
HEXADACTYLIC HIERATICALLY HOMEOTYPICAL HYDRAULICKED HYDROCEPHALI
HYDROCEPHALY HYDROELASTIC HYGIENICALLY HYPERALGESIC HYPERBOLICAL
HYPERDACTYLY HYPERDULICAL HYPERPLASTIC HYPERTYPICAL HYPOCALCEMIA
HYPOCALCEMIC HYPOGLYCEMIA HYPOTHETICAL HYPOVOLAEMIC HYSTERICALLY
ILLEGITIMACY IMMACULATELY INACCESSIBLY INACCURATELY INCHOATIVELY
INCIDENTALLY INCREASINGLY INDECLINABLY INDELICATELY INDICATIVELY
INEFFACEABLY INELASTICITY INERADICABLY INEXPLICABLY INEXTRICABLY
INTERFACULTY INTERLACEDLY INTERLOCALLY LACERABILITY LACHRYMARIES
LACHRYMOSELY LANCEOLATELY LARYNGECTOMY LARYNGOSCOPE LEACHABILITY
LENTICULARLY LEPTODACTYLS LEXICOGRAPHY LYCANTHROPES MACROCEPHALY
MAENADICALLY MAGNETICALLY MAJESTICALLY MECAMYLAMINE MECHANICALLY
MELANCHOLILY MENDACIOUSLY MEPHITICALLY MERCURIALITY MERISTICALLY
MESMERICALLY METALLICALLY METAPHYSICAL METEORICALLY METHACRYLATE
METHODICALLY MICROCEPHALY MNEMONICALLY MOLECULARITY MULTIVALENCY
MYELOBLASTIC MYSTICALNESS NECTOCALYCES NEOLOGICALLY NEOTERICALLY
NEUROTICALLY NEUROTYPICAL NOEMATICALLY NYCHTHEMERAL OCCIDENTALLY
OCTAHEDRALLY OCTOSYLLABLE OLEANDOMYCIN OLFACTOMETRY OPALESCENTLY
OPERATICALLY ORCHESTRALLY OROGENICALLY ORTHOCEPHALY OVERCLASSIFY
OXYACETYLENE OXYCEPHALIES OXYCEPHALOUS PALEOECOLOGY PANICULATELY
PATELLECTOMY PATHETICALLY PEDANTICALLY PENTADACTYLE PENTADACTYLS
PENTADACTYLY PENTAVALENCY PERCEPTUALLY PERIODICALLY PHENOTYPICAL
PHONEMICALLY PHONETICALLY PHYLACTERIES PHYLETICALLY PHYLLOCLADES
PHYSICALIZED PHYSICALIZES PHYSICALNESS PINEALECTOMY PLACENTOLOGY
PLEBISCITARY POLICYMAKERS POLYCHAETOUS POLYCYTHEMIA POLYNUCLEATE
POLYVALENCES PRECARIOUSLY PRELATICALLY PREMEDICALLY PROCEDURALLY
PROTEOGLYCAN PROTRACTEDLY PSYCHEDELIAS PSYCHOBABBLE PSYCHODELIAS
PSYCHOSEXUAL PTERODACTYLE PTERODACTYLS PYELOGRAPHIC PYROCATECHOL
PYROCHEMICAL PYROMETRICAL RADIOECOLOGY RADIOLUCENCY RALLYCROSSES
RECIPROCALLY RECOGNISABLY RECOGNIZABLY RECONCILABLY RECREATIVELY
RECYCLEABLES REFRACTIVELY REFRACTORILY REPROACHABLY RETICULATELY
RETRACTILITY RETRACTIVELY REVOCABILITY RHETORICALLY SACCHARINELY
SACERDOTALLY SALICYLAMIDE SANCTIFIEDLY SCATTERINGLY SCLERENCHYMA
SEMANTICALLY SEMIMYSTICAL SEMIOTICALLY SEPTICIDALLY SEPULCHRALLY
SEQUACIOUSLY SERAPHICALLY SHAMEFACEDLY SPECIFICALLY SPHERICALITY
SUBCENTRALLY SUBSPECIALTY SUCCESSANTLY SUPERCILIARY SYLLABICATED
SYLLABICATES SYNDACTYLIES SYNDETICALLY SYNECTICALLY SYNERGICALLY
SYSTEMATICAL SYSTEMICALLY TEACHABILITY TECHNICALITY TECTONICALLY
TELERGICALLY TENDENCIALLY TERRIFICALLY TETRACYCLINE TETRADACTYLS
TETRADACTYLY TETRAVALENCY THEATRICALLY THEISTICALLY THEMATICALLY
THEURGICALLY TRACEABILITY TRANSCALENCY TRANSILIENCY TRANSLUCENCY
TUBERCULARLY TYPICALITIES UNACCEPTABLY UNAFFECTEDLY UNCHANGEABLY
UNDETECTABLY UNEROTICALLY UNGRACEFULLY UNHEROICALLY UNHYSTERICAL
UNICAMERALLY UNNOTICEABLY UNPEACEFULLY UNPOETICALLY UNQUENCHABLY
UNRECYCLABLE UNSEARCHABLY VERIDICALITY VERMICULARLY VERNACULARLY
VESICULARITY VINYLCYANIDE YELLOWJACKET