Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

547. Dupe — N. dupe, gull, gudgeon, gobemouche†, cull [Slang], cully†,

victim, pigeon, April fool†; jay [Slang], sucker [Slang]; laughingstock &c 857; Cyclops, simple Simon, flat; greenhorn; fool &c 501; puppet, cat's paw. V. be deceived &c 545, be the dupe of; fall into a trap; swallow the bait, nibble at the bait; bite, catch a Tartar. Adj. credulous &c 486; mistaken &c (error) 495.