hammer vs blow

hammer and blow both are nouns.

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

As nouns, blow is a hypernym of hammer; that is, blow is a word with a broader meaning than hammer:

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

hammer (verb)	blow (verb)
beat with or as if with a hammer	exhale hard
create by hammering	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