Yes, trained is a Scrabble word!

Adjective

1. Shaped or conditioned or disciplined by training; often used as a combining form

Verb

1. Create by training and teaching

2. Undergo training or instruction in preparation for a particular role, function, or profession

3. Develop (children's) behavior by instruction and practice; especially to teach self-control

4. Educate for a future role or function

5. Teach or refine to be discriminative in taste or judgment

6. Point or cause to go (blows, weapons, or objects such as photographic equipment) towards

7. Teach and supervise (someone); act as a trainer or coach (to), as in sports

8. Exercise in order to prepare for an event or competition

9. Cause to grow in a certain way by tying and pruning it

10. Travel by rail or train

11. Drag loosely along a surface; allow to sweep the ground