Is “Grumble” a Scrabble word?
Yes
GRUMBLE
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 Grumble
/ˈɡɹʌmbl̩/
noun
1.A low thundering, rumbling or growling sound.
2.The sound made by a hungry stomach.
3.A surly complaint.
“That whiner is never without a grumble to share.”
verb
1.To make a low, growling or rumbling noise, like a hungry stomach or certain animals.
“The distant thunder grumbles.”
2.To complain; to murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner.
“He grumbles about the food constantly, but has yet to learn to cook.”
3.To utter in a grumbling fashion.