Is “Vivat” a Scrabble word?
Yes
VIVAT
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 Vivat
/ˈvaɪvæt/
noun
1.An utterance of the interjection vivat.
interjection
1.A cry wishing someone long life and prosperity.