Melanesia vs Solomon Islands

Melanesia and Solomon Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melanesia	Yes	No	No	No
Solomon Islands	Yes	No	No	No

Melanesia (noun)	Solomon Islands (noun)
the islands in the southwestern part of Oceania	the southern Solomon Islands that since 1978 form an independent state in the British Commonwealth
	the northernmost islands are part of Papua New Guinea; the remainder form an independent state within the British Commonwealth