Is “Screwup” a Scrabble word?
Yes
SCREWUP
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 Screwup
noun
1.A substantial mistake, usually causing problems for more people than just the person or group who made it.
2.A person who often makes substantial mistakes; a bungler.
3.A person who is mentally or emotionally damaged.