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: boxing terminology 
Words: corner, fold, deck, knockout, level

SOLUTION: fold

PROBLEM: Category: physical property 
Words: protein, pasty, fat, thin, angular momentum

SOLUTION: protein

PROBLEM: Category: employment activity 
Words: empower, fire, remove, air, pay

SOLUTION:
air