fool
noun
a person who lacks good judgment
a person who is gullible and easy to take advantage of
a professional clown employed to entertain a king or nobleman in the Middle Ages
verb
make a fool or dupe of
spend frivolously and unwisely
“Fritter away one's inheritance”
fool or hoax
“The immigrant was duped because he trusted everyone”
“You can't fool me!”
indulge in horseplay
“Enough horsing around--let's get back to work!”
“The bored children were fooling about”
Source: WordNet 3.1, Princeton University
