Similar Words to Blackjack:

Black Flag
Blackjack Oak
Blackmail
Cosh
Jack Oak
Jolly Roger
Pirate Flag
Pressure
Quercus Marilandica
Sap
Twenty-one
Vingt-et-un

Examples:

1. Marry an undertaker, marry a blackjack dealer, marry a pickpocket, but never marry a newspaperman.

Definitions of Blackjack:

1. A common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets
2. A piece of metal covered by leather with a flexible handle; used for hitting people
3. A flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
4. A gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21
5. Exert pressure on someone through threats