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: shady activities 
Words: invent, smuggled, smear, fudge, pie
Example Output: pie

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

Example Input: Category: emotional display 
Words: follow, woo, cub, swoon, fawn
Example Output:
cub