repeating firearm vs small-arm

repeating firearm and small-arm both are nouns.

Word	Noun	Adjective	Verb	Adverb
repeating firearm	Yes	No	No	No
small-arm	Yes	No	No	No

As nouns, small-arm is a hypernym of repeating firearm; that is, small-arm is a word with a broader meaning than repeating firearm:

Other hypernyms of repeating firearm include firearm, piece.

repeating firearm (noun)	small-arm (noun)
a firearm that can fire several rounds without reloading	a portable gun