From WordNet (r) 3.0 (2006):
gull
n 1: a person who is gullible and easy to take advantage of
[syn: chump, fool, gull, mark, patsy, fall guy,
sucker, soft touch, mug]
2: mostly white aquatic bird having long pointed wings and short
legs [syn: gull, seagull, sea gull]
v 1: make a fool or dupe of [syn: fool, gull, befool]
2: fool or hoax; "The immigrant was duped because he trusted
everyone"; "You can't fool me!" [syn: gull, dupe,
slang, befool, cod, fool, put on, take in, put
one over, put one across]