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: boats 
Words: hull, deck, rudder, check, lifeline
Example Output: check

Example Input: Category: employment activity 
Words: fire, remove, praise, inferno, replace
Example Output: inferno

Example Input: Category: chocolate food 
Words: brownies, chocolate, smuggled, brownie, fudge
Example Output:
smuggled