Asian nation vs Nippon

Asian nation and Nippon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Asian nation	Yes	No	No	No
Nippon	Yes	No	No	No

Asian nation (noun)	Nippon (noun)
any one of the nations occupying the Asian continent	a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building