Ryukyuan vs Japan

Ryukyuan and Japan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ryukyuan	Yes	No	No	No
Japan	Yes	No	No	No

Ryukyuan (noun)	Japan (noun)
the language (related to Japanese) that is spoken by the people of the Ryukyu Islands	a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building
a member of the Japanese people living on the Ryukyu Islands southwest of Japan	a string of more than 3,000 islands to the east of Asia extending 1,300 miles between the Sea of Japan and the western Pacific Ocean