Yes, infest is a Scrabble word!
...and is worth 9 points in Scrabble, and 10 points in Words with Friends
infest
Verb
1. Invade in great numbers
2. Occupy in large numbers or live on a host
3. Live on or in a host, as of parasites
What Scrabble words can I make with the letters in infest?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words