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: goat, cat, fish, hamster, hunting

SOLUTION: hunting

PROBLEM: Category: aesthetic characteristic 
Words: medium, just, light, ghostly, fair

SOLUTION: just

PROBLEM: Category: emotional status 
Words: mad, happy, fine, alright, arrest

SOLUTION:
arrest