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: bird 
Words: winch, swallow, winch, crane, parrot
Example Output: winch

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

Example Input: Category: physical activity 
Words: lift, stoop, fall, equinox, tumble
Example Output:
equinox