TASK DEFINITION: Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
PROBLEM: close, nearest, touching, on top of, barred

SOLUTION: barred

PROBLEM: cupcake, fudge, tart, smear, cream

SOLUTION: smear

PROBLEM: club, lettuce, hero, picnic, open-faced

SOLUTION:
picnic