Republic of El Salvador vs El Salvador

Republic of El Salvador and El Salvador both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of El Salvador	Yes	No	No	No
El Salvador	Yes	No	No	No

As nouns, Republic of El Salvador and El Salvador are synonyms defined as:

Republic of El Salvador and El Salvador: a republic on the Pacific coast of Central America

Other synonyms of Republic of El Salvador include Salvador.

Republic of El Salvador (noun)	El Salvador (noun)
a republic on the Pacific coast of Central America	a republic on the Pacific coast of Central America