Cusums is valid Scrabble Word

Is cusums a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is cusums valid Words with Friends?
Words with Friends NO

Definitions for CUSUMS in dictionary:

Words related to CUSUMS

cusum9

Similar words containing CUSUM without suffix s

cusum9
Find what other words can be done using letters: "cusums"
https://scrabble-word.com/finder/cusums
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