Yes, rot is a Scrabble word!
...and is worth 3 points in Scrabble, and 3 points in Words with Friends
rot
Verb
1. Break down
2. Become physically weaker
Noun
1. A state of decay usually accompanied by an offensive odor
2. (biology) the process of decay caused by bacterial or fungal action
3. Unacceptable behavior (especially ludicrously false statements)
What Scrabble words can I make with the letters in rot?
3 Letter Words
2 Letter Words