Is “Masterwork” a Scrabble word?
Yes
MASTERWORK
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 Masterwork
noun
1.A piece done to prove possession of skill sufficient to be ranked a master.
2.A piece of quality, indicative of having been made by a master; a masterpiece.
3.An act of primary importance.