national vs public

national and public both are nouns.

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

national (noun)	public (noun)
a person who owes allegiance to that nation	people in general considered as a whole
	a body of people sharing some common interest

national (adjective)	public (adjective)
limited to or in the interests of a particular nation	not private; open to or concerning the people as a whole
concerned with or applicable to or belonging to an entire nation or country	affecting the people or community as a whole
of or relating to or belonging to a nation or country
of or relating to nationality
characteristic of or peculiar to the people of a nation
inside the country
owned or maintained for the public by the national government