sub for

7 LETTERS · STARTS WITH S

sub for is a valid 7-letter word worth 11 points in Scrabble and 13 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1U1B3F4O1R1
1 + 1 + 3 + 0 + 4 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does sub for mean?

1