Nihon vs Nipponese

Nihon and Nipponese both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nihon	Yes	No	No	No
Nipponese	Yes	Yes	No	No

Nihon (noun)	Nipponese (noun)
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building	a native or inhabitant of Japan

Nihon (adjective)	Nipponese (adjective)
	of or relating to or characteristic of Japan or its people or their culture or language