dominion vs reign

dominion and reign both are nouns.

Word	Noun	Adjective	Verb	Adverb
dominion	Yes	No	No	No
reign	Yes	No	Yes	No

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

Other hyponyms of dominion include paramountcy, raj, sovereignty, suzerainty.

dominion (noun)	reign (noun)
a region marked off for administrative or other purposes	royal authority; the dominion of a monarch
dominance or power through legal authority	the period during which a monarch is sovereign
	a period during which something or somebody is dominant or powerful

dominion (verb)	reign (verb)
	have sovereign power
	be larger in number, quantity, power, status or importance