Is “Overwork” a Scrabble word?
Yes
OVERWORK
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 Overwork
/ˌəʊvəˈwɜːk/
verb
1.To make (someone) work too hard.
“to overwork a horse”
2.To work too hard.
3.To fill too full of work; to crowd with labour.