Is “Scumble” a Scrabble word?
Yes
SCUMBLE
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Scumble
/ˈskʌmbəl/
noun
1.An opaque kind of glaze (layer of paint).
verb
1.To apply an opaque glaze to an area of a painting to make it softer or duller.