Yes, plumed is a Scrabble word!

Adjective

1. Having or covered with or abounding in plumes

2. Having an ornamental plume or feathery tuft

3. (of a knight's helmet) having a decorative plume

Verb

1. Rip off; ask an unreasonable price

2. Be proud of

3. Deck with a plume

4. Clean with one's bill

5. Form a plume

6. Dress or groom with elaborate care