Yes, cusp is a Scrabble word!
...and is worth 8 points in Scrabble, and 11 points in Words with Friends
cusp
Noun
1. Point formed by two intersecting arcs (as from the intrados of a Gothic arch)
2. A thin triangular flap of a heart valve
3. Small elevation on the grinding surface of a tooth
What Scrabble words can I make with the letters in cusp?
4 Letter Words
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3 Letter Words
2 Letter Words