Is “Vanquish” a Scrabble word?
Yes
VANQUISH
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 Vanquish
/ˈvæŋkwɪʃ/
verb
1.To defeat, to overcome.