civic center vs down town

civic center and down town both are nouns.

Word	Noun	Adjective	Verb	Adverb
civic center	Yes	No	No	No
down town	Yes	No	No	No

As nouns, civic center and down town are synonyms defined as:

Other synonyms of civic center include municipal center.

civic center (noun)	down town (noun)
a center where the members of a community can gather for social or cultural activities	the center of a city
the center of a city