Yes, every is a Scrabble word!
...and is worth 11 points in Scrabble, and 11 points in Words with Friends
every
Adjective
1. (used of count nouns) each and all of the members of a group considered singly and without exception
2. Each and all of a series of entities or intervals as specified
What Scrabble words can I make with the letters in every?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words