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: aesthetic characteristic 
Words: fine, ticket, dull, neat, detailed
Example Output: ticket

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

Example Input: Category: window material 
Words: panel, fork, wood, glass, vinyl
Example Output:
fork