blow vs hammer

blow and hammer both are nouns.

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

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

blow (noun)	hammer (noun)
a powerful stroke with the fist or a weapon	the act of pounding (delivering repeated heavy blows)
forceful exhalation through the nose or mouth	a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking
street names for cocaine	a power tool for drilling rocks
an impact (as from a collision)	a striker that is covered in felt and that causes the piano strings to vibrate
an unpleasant or disappointing surprise	a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc.
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating	the part of a gunlock that strikes the percussion cap when the trigger is pulled
a strong current of air	a heavy metal sphere attached to a flexible wire; used in the hammer throw
	the ossicle attached to the eardrum

blow (verb)	hammer (verb)
exhale hard	beat with or as if with a hammer
free of obstruction by blowing air through	create by hammering
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