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: social gathering 
Words: convention, club, discothek, hamburger, dance hall
Example Output: hamburger

Example Input: Category: date status 
Words: belated, current, tide, up to the moment, postponed
Example Output: tide

Example Input: Category: body part 
Words: elbow, foot, knee, inch, hand
Example Output:
inch