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.

Example Input: Category: baby animals 
Words: lust, kitten, deer, bambi, fawn
Example Output: lust

Example Input: Category: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive
Example Output: refreshing

Example Input: Category: card games 
Words: poker, blackjack, gin, spades, whisky
Example Output:
whisky