Is “Crupper” a Scrabble word?
Yes
CRUPPER
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 Crupper
/ˈkɹʌpə/
noun
1.A strap, looped under a horse's tail, used to stop a saddle from slipping.
2.The buttocks or rump, especially of a horse.
3.A piece of armour covering the hindquarters of a horse.
Synonyms: croupe
verb
1.To fit with a crupper; to place a crupper upon.
“to crupper a horse”