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: moral characteristic 
Words: mild, equitable, unprejudiced, trustworthy, fair
Example Output: mild

Example Input: Category: employment activity 
Words: pay, instruct, heat, fire, scold
Example Output: heat

Example Input: Category: animal 
Words: goat, dog, canoe, fish, mice
Example Output:
canoe