Is “Slub” a Scrabble word?
Yes
SLUB
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 Slub
/slʌb/
noun
1.A small thickened portion or knot found on linen yarn, caused by defects.
2.Fabric fiber produced by slubbing.
verb
1.To draw and twist fibers in order to prepare them for spinning.