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: light, unprejudiced, honorable, fair, unjust
Example Output: light

Example Input: Category: social gathering 
Words: picnic, french toast, clan, club, bar
Example Output: french toast

Example Input: Category: construction 
Words: tackle, windlass, davit, hoist, crane
Example Output:
hoist