Yes, lav is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
lav
Noun
1. A room or building equipped with one or more toilets
What Scrabble words can I make with the letters in lav?
2 Letter Words
Noun
1. A room or building equipped with one or more toilets
2 Letter Words