Nippon vs Japanese language

Nippon and Japanese language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nippon	Yes	No	No	No
Japanese language	Yes	No	No	No

Nippon (noun)	Japanese language (noun)
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building	the language (usually considered to be Altaic) spoken by the Japanese