capital of Latvia vs Riga

capital of Latvia and Riga both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Latvia	Yes	No	No	No
Riga	Yes	No	No	No

As nouns, capital of Latvia and Riga are synonyms defined as:

capital of Latvia and Riga: a port city on the Gulf of Riga that is the capital and largest city of Latvia; formerly a member of the Hanseatic League

capital of Latvia (noun)	Riga (noun)
a port city on the Gulf of Riga that is the capital and largest city of Latvia; formerly a member of the Hanseatic League	a port city on the Gulf of Riga that is the capital and largest city of Latvia; formerly a member of the Hanseatic League