blow vs knock

blow and knock both are nouns.

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

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

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

blow (noun)	knock (noun)
a powerful stroke with the fist or a weapon	the act of hitting vigorously
forceful exhalation through the nose or mouth	negative criticism
street names for cocaine	a vigorous blow
an impact (as from a collision)	the sound of knocking (as on a door or in an engine or bearing)
an unpleasant or disappointing surprise	a bad experience
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
a strong current of air

blow (verb)	knock (verb)
exhale hard	find fault with; express criticism of; point out real or perceived flaws
free of obstruction by blowing air through	knock against with force or violence
melt, break, or become otherwise unusable	rap with the knuckles
burst suddenly	deliver a sharp blow or push
shape by blowing	make light, repeated taps on a surface
show off	sound like a car engine that is firing too early
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