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: boats 
Words: deck, gunwale, queen, lifeline, bridge
Example Output: queen

Example Input: Category: aesthetic characteristic 
Words: high quality, ok, level, classy, fine
Example Output: ok

Example Input: Category: outdoor sport activity 
Words: fish, stingray, climbing, trap, hiking
Example Output:
stingray