Is “Horsebox” a Scrabble word?
Yes
HORSEBOX
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 Horsebox
noun
1.A motor vehicle for transporting horses.
2.A container for transporting horses in, whether by road, rail or sea.