sprawl vs urban area

sprawl and urban area both are nouns.

Word	Noun	Adjective	Verb	Adverb
sprawl	Yes	No	Yes	No
urban area	Yes	No	No	No

As nouns, urban area is a hypernym of sprawl; that is, urban area is a word with a broader meaning than sprawl:

Other hypernyms of sprawl include populated area.

sprawl (noun)	urban area (noun)
an ungainly posture with arms and legs spread about	a geographical area constituting a city or town
an aggregation or continuous network of urban communities

sprawl (verb)	urban area (verb)
sit or lie with one's limbs spread out
go, come, or spread in a rambling or irregular way