#1 fool n. [sap, saphead, muggins, tomfool] a person who lacks good judgment. wn
#2 fool n. [chump, gull, mark, patsy, fall guy, sucker, soft touch, mug] a person who is gullible and easy to take advantage of. wn
#3 fool v. [gull, befool] make a fool or dupe of. wn
#4 fool n. [jester, motley fool] a professional clown employed to entertain a king or nobleman in the Middle Ages. wn
#5 fool v. [fritter, frivol away, dissipate, shoot, fritter away, fool away] spend frivolously and unwisely; "Fritter away one's inheritance". wn
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