Japan vs Japanese

Japan and Japanese both are nouns.

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

Japan (noun)	Japanese (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
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 native or inhabitant of Japan

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