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: animal 
Words: hamster, mice, fish, tiger, row
Example Output: row

Example Input: Category: physical property 
Words: protein, pasty, fat, thin, angular momentum
Example Output: protein

Example Input: Category: consumer product 
Words: fearful, food, thing, content, shop
Example Output:
fearful