Vet.

Noun

veteran (plural veterans)

1. A person with long experience of a particular activity.
   • The company's new hires were nervous, but the veterans were self-assured because, as one summarized it, "this isn't our first rodeo."

   Synonyms:

   old hand, old-timer, warhorse

   1. A person who has served in the armed forces, especially an old soldier who has seen long service.
      • We honor veterans and senior citizens with a ten percent discount.
2. (figuratively) A group, animal, etc. with long experience of a particular activity.
   • Their mules were clearly veterans. They seemed to know what to do even better than the teenage farmhand who was driving the team.

See all 11 meanings of veteran