publicity vs public

publicity and public both are nouns.

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

publicity (noun)	public (noun)
the quality of being open to public view	people in general considered as a whole
a message issued in behalf of some product or cause or idea or person or institution	a body of people sharing some common interest

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