Visayas vs Visayan Islands

Visayas and Visayan Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Visayas	Yes	No	No	No
Visayan Islands	Yes	No	No	No

As nouns, Visayas and Visayan Islands are synonyms defined as:

Visayas and Visayan Islands: group of islands in the central Philippines

Other synonyms of Visayas include Bisayas.

Visayas (noun)	Visayan Islands (noun)
group of islands in the central Philippines	group of islands in the central Philippines