automatic weapon vs self-loader

automatic weapon and self-loader both are nouns.

Word	Noun	Adjective	Verb	Adverb
automatic weapon	Yes	No	No	No
self-loader	Yes	No	No	No

As nouns, self-loader is a hypernym of automatic weapon; that is, self-loader is a word with a broader meaning than automatic weapon:

automatic weapon: a firearm that reloads itself and keeps firing until the trigger is released
self-loader: a firearm that reloads itself

Other hypernyms of automatic weapon include autoloader.

automatic weapon (noun)	self-loader (noun)
a firearm that reloads itself and keeps firing until the trigger is released	a firearm that reloads itself