public vs publicity

public and publicity both are nouns.

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

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

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