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: weather 
Words: sunny, loyal, tangle, fair, raining
Example Output: loyal

Example Input: Category: accomodation 
Words: apartment, cabin, squashed, smooth, flat
Example Output: smooth

Example Input: Category: boxing terminology 
Words: tko, jab, crew, level, deck
Example Output:
crew