Is “Starker” a Scrabble word?
Yes
STARKER
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 Starker
adjective
1.Hard, firm; obdurate.
2.Severe; violent; fierce (now usually in describing the weather).
3.Strong; vigorous; powerful.