Dar es Salaam vs capital of Tanzania

Dar es Salaam and capital of Tanzania both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dar es Salaam	Yes	No	No	No
capital of Tanzania	Yes	No	No	No

As nouns, Dar es Salaam and capital of Tanzania are synonyms defined as:

Dar es Salaam and capital of Tanzania: the capital and largest port city of Tanzania on the Indian Ocean

Dar es Salaam (noun)	capital of Tanzania (noun)
the capital and largest port city of Tanzania on the Indian Ocean	the capital and largest port city of Tanzania on the Indian Ocean