Yes, incest is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
incest
Noun
1. Sexual intercourse between persons too closely related to marry (as between a parent and a child)
What Scrabble words can I make with the letters in incest?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words