repeating firearm vs repeater

repeating firearm and repeater both are nouns.

Word	Noun	Adjective	Verb	Adverb
repeating firearm	Yes	No	No	No
repeater	Yes	No	No	No

As nouns, repeating firearm and repeater are synonyms defined as:

repeating firearm and repeater: a firearm that can fire several rounds without reloading

repeating firearm (noun)	repeater (noun)
a firearm that can fire several rounds without reloading	a firearm that can fire several rounds without reloading
	(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)