zip gun vs handgun

zip gun and handgun both are nouns.

Word	Noun	Adjective	Verb	Adverb
zip gun	Yes	No	No	No
handgun	Yes	No	No	No

As nouns, handgun is a hypernym of zip gun; that is, handgun is a word with a broader meaning than zip gun:

Other hypernyms of zip gun include pistol, shooting iron, side arm.

zip gun (noun)	handgun (noun)
a crude homemade pistol	a firearm that is held and fired with one hand