Discourser

n.	1.	One who discourse; a narrator; a speaker; an haranguer. In his conversation he was the most clear discourser. - Milward.
	2.	The writer of a treatise or dissertation. Philologers and critical discoursers. - Sir T. Browne.

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