heaven vs region

heaven and region both are nouns.

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

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

Other hypernyms of heaven include part.

heaven (noun)	region (noun)
any place of complete bliss and delight and peace	a part of an animal that has a special function or is supplied by a given artery or nerve
	a knowledge domain that you are interested in or are communicating about
	the extended spatial location of something
	a large indefinite location on the surface of the Earth
	the approximate amount of something (usually used prepositionally as in `in the region of')