Yes, frets is a Scrabble word!

Verb

1. Worry unnecessarily or excessively

2. Be agitated or irritated

3. Provide (a musical instrument) with frets

4. Become or make sore by or as if by rubbing

5. Cause annoyance in

6. Gnaw into; make resentful or angry

7. Carve a pattern into

8. Decorate with an interlaced design

9. Be too tight; rub or press

10. Cause friction

11. Remove soil or rock

12. Wear away or erode

Noun

1. Agitation resulting from active worry

2. A spot that has been worn away by abrasion or erosion

3. An ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)

4. A small bar of metal across the fingerboard of a musical instrument; when the string is stopped by a finger at the metal bar it will produce a note of the desired pitch