capital of Mongolia vs Urga

capital of Mongolia and Urga both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Mongolia	Yes	No	No	No
Urga	Yes	No	No	No

As nouns, capital of Mongolia and Urga are synonyms defined as:

Other synonyms of capital of Mongolia include Kulun, Ulaanbaatar, Ulan Bator.

capital of Mongolia (noun)	Urga (noun)
the capital and largest city of Mongolia	the capital and largest city of Mongolia