Dupe :: Dupe (n.) One who has been deceived or who is easily deceived; a gull; as, the dupe of a schemer..
Dupe :: Dupe (n.) To deceive; to trick; to mislead by imposing on one's credulity; to gull; as, dupe one by flattery..
Duper :: Duper (n.) One who dupes another.
Dupery :: Dupery (n.) The act or practice of duping.