Yes, cusp is in the scrabble dictionary

...and is worth 11 points by itself.

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Cusp Definition

noun

A point or pointed end.
from The American Heritage Dictionary of the English Language, 4th Edition
A transitional point or time, as between two astrological signs.
from The American Heritage Dictionary of the English Language, 4th Edition
Anatomy A pointed or rounded projection on the chewing surface of a tooth.
from The American Heritage Dictionary of the English Language, 4th Edition
Anatomy A triangular fold or flap of a heart valve.
from The American Heritage Dictionary of the English Language, 4th Edition
Architecture The point of intersection of two ornamental arcs or curves, such as the inner points of a trefoil.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

cups

8

2 letter words with CUSP

Points

up

4

us

2

3 letter words with CUSP

Points

cup

7

pus

5

sup

5

ups

5

4 letter words with CUSP

Points

cups

8

cusp

8

scup

8

Found 9 words in 0.13601 seconds