Yes, mere is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
mere
Adjective
1. Being nothing more than specified
2. Apart from anything else; without additions or modifications
Noun
1. A small pond of standing water
What Scrabble words can I make with the letters in mere?
3 Letter Words
2 Letter Words