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36 words ending with an, 13 letters long

arithmetician assemblywoman authoritarian bildungsroman businesswoman callithumpian cliometrician coastguardman communitarian congresswoman cybernetician diagnostician documentarian foraminiferan geopolitician handcraftsman inegalitarian linguistician lowerclassman malacostracan mastigophoran mathematician megalopolitan metaphysician necessitarian nonpolitician nonvegetarian ornithischian paediatrician peptidoglycan postlapsarian supersalesman terpsichorean underclassman upperclassman valedictorian