(n.) A preacher; a sermonizer.

Boanerges author chalk talker collocutor colloquialist conversational partner conversationalist converser descanter dialogist disquisitor essayist expositor expounder homilist interlocutor interlocutress interlocutrice interlocutrix lecturer monographer monographist palaverer parleyer praelector preacher pulpitarian pulpiteer reader sermoner sermonist sermonizer talker tractation writer