Japanese Islands vs Pacific

Japanese Islands and Pacific both are nouns.

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

Japanese Islands (noun)	Pacific (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

Japanese Islands (adjective)	Pacific (adjective)
	relating to or bordering the Pacific Ocean