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: outdoor sport activity 
Words: wrestle, fish, iguana, hiking, hunt
Example Output: iguana

Example Input: Category: food 
Words: meat, weenie, loyalty, frank, vittles
Example Output: loyalty

Example Input: Category: physical property 
Words: protein, chunky, big boned, fat, capacitance
Example Output:
protein