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: consumer product 
Words: merchandise, happy, thing, content, service
Example Output: happy

Example Input: Category: boxing terminology 
Words: glove, level, deck, corner, board
Example Output: board

Example Input: Category: outdoor sport activity 
Words: fish, hunt, wrestle, sea turtle, kayak
Example Output:
sea turtle