capital of Iran vs Teheran

capital of Iran and Teheran both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Iran	Yes	No	No	No
Teheran	Yes	No	No	No

As nouns, capital of Iran and Teheran are synonyms defined as:

capital of Iran and Teheran: the capital and largest city of Iran; located in northern Iran

Other synonyms of capital of Iran include Iranian capital, Tehran.

capital of Iran (noun)	Teheran (noun)
the capital and largest city of Iran; located in northern Iran	the capital and largest city of Iran; located in northern Iran