semiautomatic pistol vs pistol

semiautomatic pistol and pistol both are nouns.

Word	Noun	Adjective	Verb	Adverb
semiautomatic pistol	Yes	No	No	No
pistol	Yes	No	No	No

As nouns, pistol is a hypernym of semiautomatic pistol; that is, pistol is a word with a broader meaning than semiautomatic pistol:

semiautomatic pistol: a pistol that is a semiautomatic firearm capable of loading and firing continuously
pistol: a firearm that is held and fired with one hand

Other hypernyms of semiautomatic pistol include handgun, shooting iron, side arm, semiautomatic firearm.

semiautomatic pistol (noun)	pistol (noun)
a pistol that is a semiautomatic firearm capable of loading and firing continuously	a firearm that is held and fired with one hand