flimflam

bluff, feint

cheating, chicanery, cozenage, craft, cunning, deception, duplicity, fakery, jugglery, legerdemain, skulduggery (or skullduggery), subterfuge, swindling, trickery

fraud, hoax, sham, swindle

blind, front, smoke screen

cross, fix

Ponzi scheme, pyramid scheme

racket, rip-off

thimblerig, three-card monte

device, dodge, gimmick, jig, ploy, scheme, sleight, stratagem, trick, wile

counterfeit, fake, forgery, hoax, humbug, phony (also phoney), sham