Japan vs Ryukyuan

Japan and Ryukyuan both are nouns.

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

Japan (noun)	Ryukyuan (noun)
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building	the language (related to Japanese) that is spoken by the people of the Ryukyu Islands
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	a member of the Japanese people living on the Ryukyu Islands southwest of Japan