side vs region

side and region both are nouns.

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

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

side: either the left or right half of a body
region: a part of an animal that has a special function or is supplied by a given artery or nerve

Other hypernyms of side include area.

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

side: a place within a region identified relative to a center or reference location
region: the extended spatial location of something

Other hypernyms of side include part.

side (noun)	region (noun)
an extended outer surface of an object	a part of an animal that has a special function or is supplied by a given artery or nerve
either the left or right half of a body	a knowledge domain that you are interested in or are communicating about
an aspect of something (as contrasted with some other implied aspect)	the extended spatial location of something
an opinion that is held in opposition to another in an argument or dispute	a large indefinite location on the surface of the Earth
(sports) the spin given to a ball by striking it on one side or releasing it with a sharp twist	the approximate amount of something (usually used prepositionally as in `in the region of')
a lengthwise dressed half of an animal's carcass used for food
one of two or more contesting groups
a family line of descent
a surface forming part of the outside of an object
a line segment forming part of the perimeter of a plane figure
a place within a region identified relative to a center or reference location
an elevated geological formation

side (adjective)	region (adjective)
located on a side

side (verb)	region (verb)
take sides for or against