Santo Domingo vs capital of the Dominican Republic

Santo Domingo and capital of the Dominican Republic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Santo Domingo	Yes	No	No	No
capital of the Dominican Republic	Yes	No	No	No

As nouns, Santo Domingo and capital of the Dominican Republic are synonyms defined as:

Santo Domingo and capital of the Dominican Republic: the capital and largest city of the Dominican Republic

Other synonyms of Santo Domingo include Ciudad Trujillo.

Santo Domingo (noun)	capital of the Dominican Republic (noun)
the capital and largest city of the Dominican Republic	the capital and largest city of the Dominican Republic