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: animal 
Words: stingray, horse, iguana, wrestle, fish

SOLUTION: wrestle

PROBLEM: Category: shady activities 
Words: falsification, wrongful, rich, fudge, unlicensed

SOLUTION: rich

PROBLEM: Category: police punishment 
Words: custody, arrest, firstrate, fine, content

SOLUTION:
content