revolver vs six-shooter

revolver and six-shooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
revolver	Yes	No	No	No
six-shooter	Yes	No	No	No

As nouns, revolver and six-shooter are synonyms defined as:

revolver and six-shooter: a pistol with a revolving cylinder (usually having six chambers for bullets)

Other synonyms of revolver include six-gun.

revolver (noun)	six-shooter (noun)
a pistol with a revolving cylinder (usually having six chambers for bullets)	a pistol with a revolving cylinder (usually having six chambers for bullets)
a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings