Nihon vs Japanese Red Army

Nihon and Japanese Red Army both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nihon	Yes	No	No	No
Japanese Red Army	Yes	No	No	No

Nihon (noun)	Japanese Red Army (noun)
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building	a terrorist group organized in 1970 to overthrow the Japanese government and monarchy and to foment world revolution; is said to have close ties with Palestinian terrorists