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: flat, horizontal, smooshed, elevation, house
Example Output: house

Example Input: Category: aesthetic characteristic 
Words: ticket, fine, bright, detailed, exquisite
Example Output: ticket

Example Input: Category: guitar part 
Words: frustrated, amp, string, fret, headstock
Example Output:
frustrated