In linguistics, an agent noun is a word that is derived from another word denoting an action, and that identifies an entity that does that action. For example, "driver" is an agent noun formed from the verb "drive".

What are Agentive verbs?

Definition. Agentive verb is a verb that has an Agent as one of its arguments.

Which type of noun is gun?

gun used as a noun:

A cannon with a 6-inch/155mm minimum nominal bore diameter and tube length 30 calibers or more. See also: howitzer; mortar. JP 1-02. A very portable, short weapon, for hand use; a bullet or projectile-firing weapon; a handgun: a revolver, pistol, Derringer, zipgun, so forth.