Is “Esker” a Scrabble word?
Yes
ESKER
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 Esker
/ˈɛskə/
noun
1.A long, narrow, sinuous ridge created by deposits from a stream running beneath a glacier.
Synonyms: asar, osar, os