A revolver was a type of gun.

Brigadier Alistair Gordon Lethbridge-Stewart wielded a revolver. (TV: The Ambassadors of Death, The Mind of Evil, Planet of the Spiders, Battlefield)

Jack Harkness wielded a revolver. (TV: Utopia, Journey's End)

In River Song's World, Holy Roman Emperor Winston Churchill carried a revolver while speaking with his soothsayer, the Eleventh Doctor, at Buckingham Palace. The Doctor noted this after feeling the sensation of having been running while having no recollection of doing so, and Churchill justified himself by claiming that the Doctor was "dangerous company". Later, Churchill found that he had fired his revolver when he smelt the gunsmoke, with the Doctor soon realising that they had both been engaged in a confrontation with the memory-proof Silents. (TV: The Wedding of River Song)

The Eleventh Doctor needed to be healed by an external force after he was shot in the head with an 18th century revolver. (PROSEDead of Winter)

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