self-loading vs semiautomatic

self-loading is not a noun while semiautomatic is a noun.

Word	Noun	Adjective	Verb	Adverb
self-loading	No	Yes	No	No
semiautomatic	Yes	Yes	No	No

As adjectives, self-loading and semiautomatic are synonyms defined as:

self-loading and semiautomatic: (of firearms) capable of automatic loading and firing continuously

Other synonyms of self-loading include autoloading.

self-loading (noun)	semiautomatic (noun)
	a pistol that is a semiautomatic firearm capable of loading and firing continuously

self-loading (adjective)	semiautomatic (adjective)
(of firearms) capable of automatic loading and firing continuously	(of firearms) capable of automatic loading and firing continuously
	partially automatic