Is “Grump” a Scrabble word?
Yes
GRUMP
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 Grump
/ɡɹʌmp/
noun
1.A habitually grumpy or complaining person.
2.A grumpy mood.
verb
1.To complain.
2.To be grumpy.