working substance

17 LETTERS · STARTS WITH W

working substance is a valid 17-letter word worth 28 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

W4O1R1K5I1N1G2S1U1B3S1T1A1N1C3E1

4 + 1 + 1 + 5 + 1 + 1 + 2 + 0 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 1 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does working substance mean?