public vs private

public and private both are nouns.

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

public (noun)	private (noun)
people in general considered as a whole	an enlisted man of the lowest rank in the Army or Marines
a body of people sharing some common interest

public (adjective)	private (adjective)
not private; open to or concerning the people as a whole	confined to particular persons or groups or providing privacy
affecting the people or community as a whole	not expressed
	concerning one person exclusively
	concerning things deeply private and personal