Yes, merest is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
merest
Adjective
1. Being nothing more than specified
2. Apart from anything else; without additions or modifications
What Scrabble words can I make with the letters in merest?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words