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: type of sandwich 
Words: french toast, community, club, burger, dagwood
Example Output: community

Example Input: Category: social gathering 
Words: place, bar, doorstep, club, outing
Example Output: doorstep

Example Input: Category: type of rigidity 
Words: stiff, inflexible, streamline, unyielding, firm
Example Output:
streamline