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: direction 
Words: kind, descending, down, opposite of up, flat
Example Output: kind

Example Input: Category: social gathering 
Words: meeting, cinema, club, group, submarine
Example Output: submarine

Example Input: Category: date status 
Words: current, prompt, dastards, brine, timely
Example Output:
brine