Yes, bald is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
bald
Adjective
1. With no effort to conceal
2. Lacking hair on all or most of the scalp
3. Without the natural or usual covering
Verb
1. Grow bald; lose hair on one's head
What Scrabble words can I make with the letters in bald?
3 Letter Words
2 Letter Words