be vs prevail

be and prevail both are verbs.

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

As verbs, prevail is a hyponym of be; that is, prevail is a word with a more specific, narrower meaning than be:

be (verb)	prevail (verb)
spend or use time	use persuasion successfully
work in a specific place, with a specific subject, or in a specific function	prove superior
have an existence, be extant	continue to exist
have life, be alive	be valid, applicable, or true
form or compose	be larger in number, quantity, power, status or importance
have the quality of being; (copula, used with an adjective or a predicate noun)
occupy a certain position or area; be somewhere
be identical to; be someone or something
be identical or equivalent to
represent, as of a character on stage
be priced at
to remain unmolested, undisturbed, or uninterrupted -- used only in infinitive form