exchangeable base

17 LETTERS · STARTS WITH E

exchangeable base is a valid 17-letter word worth 33 points in Scrabble and 38 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

E1X8C3H4A1N1G2E1A1B3L1E1B3A1S1E1

1 + 8 + 3 + 4 + 1 + 1 + 2 + 1 + 1 + 3 + 1 + 1 + 0 + 3 + 1 + 1 + 1 =33 PTS

DOUBLE WORD → 66TRIPLE WORD → 99

MEANING

What does exchangeable base mean?