staplegun vs staple gun

staplegun and staple gun both are nouns.

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

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

Other synonyms of staplegun include tacker.

staplegun (noun)	staple gun (noun)
a hand-held machine for driving staples home	a hand-held machine for driving staples home