Yes, sift is a Scrabble word!
...and is worth 7 points in Scrabble, and 7 points in Words with Friends
sift
Verb
1. Move as if through a sieve
2. Separate by passing through a sieve or other straining device to separate out coarser elements
3. Check and sort carefully
4. Distinguish and separate out
What Scrabble words can I make with the letters in sift?
4 Letter Words
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3 Letter Words
2 Letter Words