capital of Mongolia vs Ulan Bator

capital of Mongolia and Ulan Bator both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Mongolia	Yes	No	No	No
Ulan Bator	Yes	No	No	No

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

capital of Mongolia and Ulan Bator: the capital and largest city of Mongolia

Other synonyms of capital of Mongolia include Kulun, Ulaanbaatar, Urga.

capital of Mongolia (noun)	Ulan Bator (noun)
the capital and largest city of Mongolia	the capital and largest city of Mongolia