Yes, bold is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
bold
Adjective
1. Fearless and daring
2. Clear and distinct
3. Very steep; having a prominent and almost vertical front
Noun
1. A typeface with thick heavy lines
What Scrabble words can I make with the letters in bold?
3 Letter Words
2 Letter Words