Marquesas Islands vs Iles Marquises

Marquesas Islands and Iles Marquises both are nouns.

Word	Noun	Adjective	Verb	Adverb
Marquesas Islands	Yes	No	No	No
Iles Marquises	Yes	No	No	No

As nouns, Marquesas Islands and Iles Marquises are synonyms defined as:

Marquesas Islands and Iles Marquises: a group of volcanic islands in the south central Pacific; part of French Polynesia

Marquesas Islands (noun)	Iles Marquises (noun)
a group of volcanic islands in the south central Pacific; part of French Polynesia	a group of volcanic islands in the south central Pacific; part of French Polynesia