slicker vs double-dealer

Other hyponyms of slicker include bluffer, four-flusher, chiseler, chiseller, defrauder, gouger, grifter, scammer, swindler, decoy, steerer, dodger, fox, slyboots, betrayer, double-crosser, traitor, two-timer, defalcator, embezzler, peculator, falsifier, finagler, wangler, counterfeiter, forger, fortune hunter, figurehead, front, front man, nominal head, straw man, strawman, dissembler, dissimulator, hypocrite, phoney, phony, pretender, imitator, impersonator, fake, faker, fraud, imposter, impostor, pretender, pseud, pseudo, role player, sham, shammer, liar, prevaricator, misleader, charlatan, mountebank, obscurantist, sandbagger, two-timer, utterer.