Yes, plume is a Scrabble word!

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

Noun

1. Anything that resembles a feather in shape or lightness

2. A feather or cluster of feathers worn as an ornament

3. The light horny waterproof structure forming the external covering of birds