Osaka Bay vs Japanese Islands

Osaka Bay and Japanese Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Osaka Bay	Yes	No	No	No
Japanese Islands	Yes	No	No	No

Osaka Bay (noun)	Japanese Islands (noun)
a bay of the western Pacific in southern Honshu	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