1) Type of Noun 
In linguistics, an agent noun (in Latin, nomen agentis) 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`. Usually, derived in the above definition has the strict sense attached to it in morphology, that is the...
a noun denoting the doer of an action, as editor or jogger.