Is “Horseback” a Scrabble word?
Yes
HORSEBACK
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 Horseback
/ˈhɔːsˌbæk/
noun
1.(usually with on, upon, etc.) The back of a horse.
2.A ridge of sand, gravel, and boulders.
Synonyms: esker
adverb
1.On the back of a horse.
“He rode horseback into town.”
Synonyms: ahorse, ahorseback, on horseback