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: bird 
Words: dump truck, tackle, crane, hoist, davit
Example Output: dump truck

Example Input: Category: corporate 
Words: synergy, combined, concerted, resistant, firm
Example Output: resistant

Example Input: Category: personal characteristic 
Words: relaxing, cool, calm, level, persistent
Example Output:
relaxing