Formosa vs Taiwan

Formosa and Taiwan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Formosa	Yes	No	No	No
Taiwan	Yes	No	No	No

As nouns, Formosa and Taiwan are synonyms defined as:

Formosa and Taiwan: an island in southeastern Asia 100 miles off the coast of mainland China in the South China Sea

Formosa (noun)	Taiwan (noun)
an island in southeastern Asia 100 miles off the coast of mainland China in the South China Sea	a government on the island of Taiwan established in 1949 by Chiang Kai-shek after the conquest of mainland China by the Communists led by Mao Zedong
	an island in southeastern Asia 100 miles off the coast of mainland China in the South China Sea