automatic vs pistol

automatic and pistol both are nouns.

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

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

automatic: a pistol that will keep firing until the ammunition is gone or the trigger is released
pistol: a firearm that is held and fired with one hand

Other hypernyms of automatic include automatic firearm, automatic gun, automatic weapon, handgun, shooting iron, side arm.

automatic (noun)	pistol (noun)
self-loading rifle capable of automatic fire	a firearm that is held and fired with one hand
a pistol that will keep firing until the ammunition is gone or the trigger is released

automatic (adjective)	pistol (adjective)
operating with minimal human intervention; independent of external control
without volition or conscious control
resembling the unthinking functioning of a machine