open cluster

12 LETTERS · STARTS WITH O

open cluster is a valid 12-letter word worth 15 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

O1P3E1N1C3L1U1S1T1E1R1

1 + 3 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =15 PTS

DOUBLE WORD → 30TRIPLE WORD → 45

MEANING

What does open cluster mean?