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: elements 
Words: ice, fire, burn, let go, combustion
Example Output: let go

Example Input: Category: fried food 
Words: fritter, croquet, dessert, seperate, doughnut
Example Output:
seperate