Yes, sob is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
sob
Verb
1. Weep convulsively
Noun
1. A dyspneic condition
2. Insulting terms of address for people who are stupid or irritating or ridiculous
3. Convulsive gasp made while weeping
What Scrabble words can I make with the letters in sob?
3 Letter Words
2 Letter Words