exurbia vs residential district

exurbia and residential district both are nouns.

Word	Noun	Adjective	Verb	Adverb
exurbia	Yes	No	No	No
residential district	Yes	No	No	No

As nouns, residential district is a hypernym of exurbia; that is, residential district is a word with a broader meaning than exurbia:

exurbia: a residential area outside of a city and beyond suburbia
residential district: a district where people live; occupied primarily by private residences

Other hypernyms of exurbia include community, residential area.

exurbia (noun)	residential district (noun)
a residential area outside of a city and beyond suburbia	a district where people live; occupied primarily by private residences