Visayan Islands vs Visayas

Visayan Islands and Visayas both are nouns.

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

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

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

Other synonyms of Visayan Islands include Bisayas.

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