twenty-two pistol vs twenty-two

twenty-two pistol and twenty-two both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty-two pistol	Yes	No	No	No
twenty-two	Yes	Yes	No	No

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

Other hypernyms of twenty-two pistol include .22.

twenty-two pistol (noun)	twenty-two (noun)
a .22-caliber pistol	a .22 caliber firearm (pistol or rifle)
	the cardinal number that is the sum of twenty-one and one

twenty-two pistol (adjective)	twenty-two (adjective)
	being two more than twenty