surface structure

17 LETTERS · STARTS WITH S

surface structure is a valid 17-letter word worth 23 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1U1R1F4A1C3E1S1T1R1U1C3T1U1R1E1

1 + 1 + 1 + 4 + 1 + 3 + 1 + 0 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does surface structure mean?