Republic of Benin vs Dahomey

Republic of Benin and Dahomey both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Benin	Yes	No	No	No
Dahomey	Yes	No	No	No

As nouns, Republic of Benin and Dahomey are synonyms defined as:

Republic of Benin and Dahomey: a country on western coast of Africa; formerly under French control

Other synonyms of Republic of Benin include Benin.

Republic of Benin (noun)	Dahomey (noun)
a country on western coast of Africa; formerly under French control	a country on western coast of Africa; formerly under French control