Open English Wordnet
Nouns
(n)blackjack oak, blackjack, jack oak, Quercus marilandicaa 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
(n)black flag, pirate flag, Jolly Roger, blackjacka flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
(n)blackjack, twenty-one, vingt-et-una 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