Nipponese vs Nihon

Nipponese and Nihon both are nouns.

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

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

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