Japan vs Asia

Japan and Asia both are nouns.

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

Japan (noun)	Asia (noun)
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building	the nations of the Asian continent collectively
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	the largest continent with 60% of the earth's population; it is joined to Europe on the west to form Eurasia; it is the site of some of the world's earliest civilizations