Malayan vs The Malay Archipelago

Malayan and The Malay Archipelago both are nouns.

Word	Noun	Adjective	Verb	Adverb
Malayan	Yes	Yes	No	No
The Malay Archipelago	Yes	No	No	No

Malayan (noun)	The Malay Archipelago (noun)
a member of a people inhabiting the northern Malay Peninsula and Malaysia and parts of the western Malay Archipelago	a group of islands in the Indian and Pacific Oceans between Asia and Australia

Malayan (adjective)	The Malay Archipelago (adjective)
of or relating to or characteristic of the people or language of Malaysia and the northern Malay Peninsula and parts of the western Malay Archipelago
of or relating to or characteristic of Malaysia