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: 70, sunny, equitable, fair, tangle
Example Output: equitable

Example Input: Category: aesthetic characteristic 
Words: handsome, detailed, calm, there, fine
Example Output: calm

Example Input: Category: bird 
Words: crane, digger, mallet, egret, swallow
Example Output:
digger