national vs compatriot

national and compatriot both are nouns.

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

As nouns, compatriot is a hyponym of national; that is, compatriot is a word with a more specific, narrower meaning than national:

Other hyponyms of national include citizen, nationalist, patriot.

national (noun)	compatriot (noun)
a person who owes allegiance to that nation	a person from your own country

national (adjective)	compatriot (adjective)
limited to or in the interests of a particular nation
concerned with or applicable to or belonging to an entire nation or country
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