city district vs turf

city district and turf both are nouns.

Word	Noun	Adjective	Verb	Adverb
city district	Yes	No	No	No
turf	Yes	No	Yes	No

As nouns, turf is a hyponym of city district; that is, turf is a word with a more specific, narrower meaning than city district:

city district (noun)	turf (noun)
a district of a town or city	range of jurisdiction or influence
	the territory claimed by a juvenile gang as its own
	surface layer of ground containing a mat of grass and grass roots

city district (verb)	turf (verb)
	cover (the ground) with a surface layer of grass or grass roots