blow vs be

blow is a noun but be is not a noun.

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

As verbs, be is a hypernym of blow; that is, be is a word with a broader meaning than blow:

blow: be inadequate or objectionable
be: have the quality of being; (copula, used with an adjective or a predicate noun)

blow (noun)	be (noun)
a powerful stroke with the fist or a weapon
forceful exhalation through the nose or mouth
street names for cocaine
an impact (as from a collision)
an unpleasant or disappointing surprise
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
a strong current of air

blow (verb)	be (verb)
exhale hard	spend or use time
free of obstruction by blowing air through	work in a specific place, with a specific subject, or in a specific function
melt, break, or become otherwise unusable	have an existence, be extant
burst suddenly	have life, be alive
shape by blowing	form or compose
show off	have the quality of being; (copula, used with an adjective or a predicate noun)
cause to be revealed and jeopardized	occupy a certain position or area; be somewhere
allow to regain its breath	be identical to; be someone or something
deposit eggs (of insects)	be identical or equivalent to
be in motion due to some air or water current	represent, as of a character on stage
cause to move by means of an air current	be priced at
leave; informal or rude	to remain unmolested, undisturbed, or uninterrupted -- used only in infinitive form
cause air to go in, on, or through
spout moist air from the blowhole
play or sound a wind instrument
make a sound as if blown
sound by having air expelled through a tube
provide sexual gratification through oral stimulation
spend lavishly or wastefully on
spend thoughtlessly; throw away
make a mess of, destroy or ruin
be inadequate or objectionable
be blowing or storming