impact vs blow

impact and blow both are nouns.

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

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

Other hyponyms of impact include bump, slam.

impact (noun)	blow (noun)
influencing strongly	a powerful stroke with the fist or a weapon
the violent interaction of individuals or groups entering into combat	forceful exhalation through the nose or mouth
the striking of one body against another	street names for cocaine
a forceful consequence; a strong effect	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

impact (verb)	blow (verb)
have an effect upon	exhale hard
press or wedge together; pack together	free of obstruction by blowing air through
	melt, break, or become otherwise unusable
	burst suddenly
	shape by blowing
	show off
	cause to be revealed and jeopardized
	allow to regain its breath
	deposit eggs (of insects)
	be in motion due to some air or water current
	cause to move by means of an air current
	leave; informal or rude
	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