Yes, fells is a Scrabble word!

Verb

1. Cause to fall by or as if by delivering a blow

2. Pass away rapidly

3. Sew a seam by folding the edges

Noun

1. The dressed skin of an animal (especially a large animal)

2. Seam made by turning under or folding together and stitching the seamed materials to avoid rough edges

3. The act of felling something (as a tree)