Synonyms for Revolver (same or very similar meaning)
WordNet sense 1 (a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings):
revolving doorWordNet sense 2 (a pistol with a revolving cylinder (usually having six chambers for bullets)):
six-gun, six-shooterFrom the ODE community, based on WordNetadd/edit