purlieu vs geographical region

purlieu and geographical region both are nouns.

Word	Noun	Adjective	Verb	Adverb
purlieu	Yes	No	No	No
geographical region	Yes	No	No	No

As nouns, geographical region is a hypernym of purlieu; that is, geographical region is a word with a broader meaning than purlieu:

Other hypernyms of purlieu include geographic area, geographic region, geographical area.

purlieu (noun)	geographical region (noun)
an outer adjacent area of any place	a demarcated area of the Earth