speaker

speaker is a Noun

Definition:

[1] One who speaks. Specifically:

[2] One who utters or pronounces a discourse; usually, one who utters a speech in public; as, the man is a good speaker, or a bad speaker.

[3] One who is the mouthpiece of others; especially, one who presides over, or speaks for, a delibrative assembly, preserving order and regulating the debates; as, the Speaker of the House of Commons, originally, the mouthpiece of the House to address the king; the Speaker of a House of Representatives.

[4] A book of selections for declamation. [U. S.]