location vs region

location and region both are nouns.

Word	Noun	Adjective	Verb	Adverb
location	Yes	No	No	No
region	Yes	No	No	No

As nouns, region is a hyponym of location; that is, region is a word with a more specific, narrower meaning than location:

location (noun)	region (noun)
a point or extent in space; a point or extent in space	a part of an animal that has a special function or is supplied by a given artery or nerve
a determination of the place where something is	a knowledge domain that you are interested in or are communicating about
the act of putting something in a certain place	the extended spatial location of something
a workplace away from a studio at which some or all of a movie may be made	a large indefinite location on the surface of the Earth
	the approximate amount of something (usually used prepositionally as in `in the region of')