black rust

10 LETTERS · STARTS WITH B

black rust is a valid 10-letter word worth 17 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3L1A1C3K5R1U1S1T1

3 + 1 + 1 + 3 + 5 + 0 + 1 + 1 + 1 + 1 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does black rust mean?