Yes, harm is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
harm
Verb
1. Cause or do harm to
Noun
1. Any physical damage to the body caused by violence or accident or fracture etc.
2. The occurrence of a change for the worse
3. The act of damaging something or someone
What Scrabble words can I make with the letters in harm?
3 Letter Words
2 Letter Words