WordNet sense 1 (a person serving a sentence in a jail or prison):

convict, inmate, jailbird, yardbird, gaolbird, convict, jail bird, yard bird

WordNet sense 2 (deprive of by deceit):

bunco, defraud, diddle, goldbrick, mulct, rook, scam, swindle, victimize, nobble, short-change, hornswoggle, gip

WordNet sense 3 (a swindle in which you cheat at gambling or persuade a person to buy worthless property):

bunko, flimflam, hustle, sting, bunco game, bunko game, confidence game, confidence trick, con game

WordNet sense 4 (commit to memory; learn by heart):

learn, memorize, memorise

WordNet sense 5 (on the negative side):

in opposition