staple gun vs tacker

staple gun and tacker both are nouns.

Word	Noun	Adjective	Verb	Adverb
staple gun	Yes	No	No	No
tacker	Yes	No	No	No

As nouns, staple gun and tacker are synonyms defined as:

Other synonyms of staple gun include staplegun.

staple gun (noun)	tacker (noun)
a hand-held machine for driving staples home	a hand-held machine for driving staples home
	a sewer who fastens a garment with long loose stitches
	a worker who fastens things by tacking them (as with tacks or by spotwelding)