market keeper

NOUN /mɑrkɪt_'kipər/
13 LETTERS · STARTS WITH M

market keeper is a valid 13-letter word worth 24 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3A1R1K5E1T1K5E1E1P3E1R1
3 + 1 + 1 + 5 + 1 + 1 + 0 + 5 + 1 + 1 + 3 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does market keeper mean?