Yes, agent is a Scrabble word!

Noun

1. An active and efficient cause; capable of producing a certain effect

2. A representative who acts on behalf of other persons or organizations

3. A substance that exerts some force or effect

4. A businessman who buys or sells for another in exchange for a commission

5. Any agent or representative of a federal agency or bureau

6. The semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause