reign vs prevail

reign is a noun but prevail is not a noun.

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

As verbs, reign and prevail are synonyms defined as:

reign and prevail: be larger in number, quantity, power, status or importance

Other synonyms of reign include dominate, predominate, rule.

reign (noun)	prevail (noun)
royal authority; the dominion of a monarch
the period during which a monarch is sovereign
a period during which something or somebody is dominant or powerful

reign (verb)	prevail (verb)
have sovereign power	use persuasion successfully
be larger in number, quantity, power, status or importance	prove superior
	continue to exist
	be valid, applicable, or true
	be larger in number, quantity, power, status or importance