TASK DEFINITION: Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
PROBLEM: Category: shady activities 
Words: invent, smuggled, smear, fudge, pie

SOLUTION: pie

PROBLEM: Category: mode of transportation 
Words: bee, swim, fly, car, walk

SOLUTION: bee

PROBLEM: Category: poker 
Words: board, joker, deck, fold, apron

SOLUTION:
apron