public vs unrestricted

public is a noun but unrestricted is not a noun.

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

public (noun)	unrestricted (noun)
people in general considered as a whole
a body of people sharing some common interest

public (adjective)	unrestricted (adjective)
not private; open to or concerning the people as a whole	not subject to or subjected to restriction
affecting the people or community as a whole	free of restrictions on conduct
	not restricted or exclusive
	never having had security classification
	not restricted or modified in meaning