repeater vs small-arm

repeater and small-arm both are nouns.

Word	Noun	Adjective	Verb	Adverb
repeater	Yes	No	No	No
small-arm	Yes	No	No	No

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

Other hypernyms of repeater include firearm, piece.

repeater (noun)	small-arm (noun)
a firearm that can fire several rounds without reloading	a portable gun
(electronics) electronic device that amplifies a signal before transmitting it again
a person who repeats
someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)