audience vs public

audience and public both are nouns.

Word	Noun	Adjective	Verb	Adverb
audience	Yes	No	No	No
public	Yes	Yes	No	No

audience (noun)	public (noun)
a conference (usually with someone important)	people in general considered as a whole
a gathering of spectators or listeners at a (usually public) performance	a body of people sharing some common interest
the part of the general public interested in a source of information, entertainment, or a product/service
an opportunity to state your case and be heard

audience (adjective)	public (adjective)
	not private; open to or concerning the people as a whole
	affecting the people or community as a whole