Is “Vaster” a Scrabble word?
Yes
VASTER
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 Vaster
adjective
1.Very large or wide (literally or figuratively).
“The Sahara desert is vast.”
2.Very great in size, amount, degree, intensity, or especially extent.
3.Waste; desert; desolate; lonely.