Yes, musk is a Scrabble word!
...and is worth 10 points in Scrabble, and 12 points in Words with Friends
musk
Noun
1. An odorous glandular secretion from the male musk deer; used as a perfume fixative
2. The scent of a greasy glandular secretion from the male musk deer
What Scrabble words can I make with the letters in musk?
3 Letter Words
2 Letter Words