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: geographical property 
Words: horizontal, hotel, flat, lined, smooth
Example Output: hotel

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

Example Input: Category: emotional status 
Words: loveful, down, emotional state, remorseful, downward
Example Output:
downward