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: elements 
Words: pay, cool, combustion, air, fire

SOLUTION: pay

PROBLEM: Category: food 
Words: fortitude, meat, cheese, frank, pork

SOLUTION: fortitude

PROBLEM: Category: police punishment 
Words: relaxed, firstrate, probation, wispy, fine

SOLUTION:
relaxed