Yes, leaven is a Scrabble word!
...and is worth 9 points in Scrabble, and 12 points in Words with Friends
leaven
Verb
1. Cause to puff up with a leaven
Noun
1. A substance used to produce fermentation in dough or a liquid
2. An influence that works subtly to lighten or modify something
What Scrabble words can I make with the letters in leaven?
5 Letter Words
4 Letter Words
Sponsored Links
3 Letter Words
2 Letter Words