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: boxing terminology 
Words: apron, punch, deck, canvas, call
Example Output: call

Example Input: Category: personal characteristic 
Words: cold, positive, calm, assured, cool
Example Output: cold

Example Input: Category: outdoor sport activity 
Words: fish, canoe, horse, hiking, canyoning
Example Output:
horse