breathing out vs blow

breathing out and blow both are nouns.

Word	Noun	Adjective	Verb	Adverb
breathing out	Yes	No	No	No
blow	Yes	No	Yes	No

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

Other hyponyms of breathing out include huffing, puffing, snorting, puff, wind.

breathing out (noun)	blow (noun)
the act of expelling air from the lungs	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

breathing out (verb)	blow (verb)
	exhale hard
	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