Japanese Islands vs Pacific Ocean

Japanese Islands and Pacific Ocean both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese Islands	Yes	No	No	No
Pacific Ocean	Yes	No	No	No

Japanese Islands (noun)	Pacific Ocean (noun)
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 ocean in the world