Yes, served is a Scrabble word!

Verb

1. Serve a purpose, role, or function

2. Do duty or hold offices; serve in a specific function

3. Contribute or conduce to

4. Be used by; as of a utility

5. Help to some food; help with food or drink

6. Provide (usually but not necessarily food)

7. Devote (part of) one's life or efforts to, as of countries, institutions, or ideas

8. Promote, benefit, or be useful or beneficial to

9. Spend time in prison or in a labor camp

10. Work for or be a servant to

11. Deliver a warrant or summons to someone

12. Be sufficient; be adequate, either in quality or quantity

13. Do military service

14. Mate with

15. Put the ball into play