1. april fool(n = noun.person) - the butt of a prank played on April 1st;
is a kind of butt, goat, laughingstock, stooge
2. april fool(n = noun.act) - a practical joke or trick played on the first day of April;
is a kind of practical joke
N laughingstock, jestingstock, gazingstock, butt, game, fair game, April fool, original, oddity, queer fish, odd fish, quiz, square toes, old monkey, old fogey, fogey monkey, fogy monkey, buffoon, pantomimist, schlemiel, jest, dum vitant stulti vitia in contraria currunt.
N dupe, gull, gudgeon, gobemouche, cull, cully, victim, pigeon, April fool, jay, sucker, laughingstock, Cyclops, simple Simon, flat, greenhorn, fool, puppet, cat's paw, credulous, mistaken.
april, april 14, april fools', april fools' day, court fool, fool, fool around, fool away, fool notion, motley fool