colloquial	like the language used when people speak together informally; informal or conversational
colloquium	an academic seminar on some field of study, led by several experts
eloquent	fluent; persuasive
grandiloquent	marked by a lofty, extravagantly colorful style
loquacious	talkative
soliloquy	a speaking alone to oneself, as in drama; a monolohue
ventriloquist	one who speaks so that the sound seem to come from somewhere other than the speaker's mouth