Nouns

(n)speaker, talker, utterer, verbalizer, verbalisersomeone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)“the speaker at commencement”, “an utterer of useful maxims”
(n)loudspeaker, speaker, speaker unit, loudspeaker system, speaker systemelectro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
(n)speakerthe presiding officer of a deliberative assembly“the leader of the majority party is the Speaker of the House of Representatives”