Is “Mismate” a Scrabble word?
Yes
MISMATE
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 Mismate
verb
1.To mate or match wrongly or unsuitably; mismatch.
“a mismated couple”