book size

9 LETTERS · STARTS WITH B

book size is a valid 9-letter word worth 23 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3O1O1K5S1I1Z10E1

3 + 1 + 1 + 5 + 0 + 1 + 1 + 10 + 1 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does book size mean?