Bespeaker is an uncommon word that refers to someone who speaks or addresses a specific subject. While there aren't many direct synonyms for "bespeaker", there are terms that could be used interchangeably depending on the context. For instance, orator, speaker, lecturer, presenter, and declaimer carry similar connotations. These words encapsulate the act of speaking in public or to an audience, often conveying knowledge, enthusiasm, or authority. Each term may differ slightly in its emphasis or specific usage, but all can serve as alternatives to "bespeaker", effectively capturing the essence of someone who speaks formally or publically about a topic of interest.