agent

a person or thing that acts

Root

ag / act: do, drive, or set in motion

Other words with the ag / act root

act: to do something
action: the act or process of doing something
agency: ability to act or an organization
agenda: a list of things to be done
agitate: to stir up or drive into motion
castigate: to criticize or punish severely
castigation: severe criticism or punishment

An agent acts or drives something forward: a doer in the scene.

The travel agent fixed the mistake before the flight.

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