Is “Blackjack” a Scrabble word?
Yes
BLACKJACK
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 Blackjack
/ˈblækdʒæk/
noun
1.A common gambling card game in casinos, where the object is to get as close to 21 without going over.
2.A hand in the game of blackjack consisting of a face card and an ace.
3.The flag (i.e., a jack) traditionally flown by pirate ships; popularly thought to be a white skull and crossed bones on a black field (the Jolly Roger).
verb
1.To strike with a blackjack or similar weapon.