Webster’s Revised Unabridged Dictionary · 1913
Discourser
Dis·cours′er (dĭs·kōrs′ẽr), 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.