Republic of Guinea vs Guinea

Republic of Guinea and Guinea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Guinea	Yes	No	No	No
Guinea	Yes	No	No	No

As nouns, Republic of Guinea and Guinea are synonyms defined as:

Republic of Guinea and Guinea: a republic in western Africa on the Atlantic; formerly a French colony; achieved independence from France in 1958

Other synonyms of Republic of Guinea include French Guinea.

Republic of Guinea (noun)	Guinea (noun)
a republic in western Africa on the Atlantic; formerly a French colony; achieved independence from France in 1958	a republic in western Africa on the Atlantic; formerly a French colony; achieved independence from France in 1958
	(ethnic slur) offensive term for a person of Italian descent