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64 words ending with an, 12 letters long

aesthetician antediluvian archdiocesan archosaurian artilleryman bacchanalian backcourtman backwoodsman biometrician cochairwoman committeeman cosmopolitan councilwoman countrywoman dialectician dibenzofuran equalitarian frontiersman futilitarian geometrician geriatrician hereditarian humanitarian hymenopteran labyrinthian lepidopteran longshoreman majoritarian metropolitan newspaperman nonagenarian nonlibrarian nonphysician nonsectarian obstetrician octogenarian onomastician onychophoran parkinsonian pediatrician pogonophoran postdiluvian prehistorian prelapsarian presbyterian proboscidean proboscidian proteoglycan salutatorian servicewoman sexagenarian spermatozoan statistician sublibrarian subterranean theoretician totalitarian trichopteran turbellarian vaudevillian vespertilian veterinarian warehouseman workingwoman