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: physical activity 
Words: trip, jump, fall, equinox, exercise
Example Output: equinox

Example Input: Category: boats 
Words: chips, crew, bow, deck, bridge
Example Output: chips

Example Input: Category: baby animals 
Words: fawn, kitten, cub, antling, paw
Example Output:
paw