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: outdoor sport activity 
Words: hike, cow, trap, row, fish
Example Output: cow

Example Input: Category: emotional status 
Words: truss rod, emotional supports, emotional upsets, emotionalities, fret
Example Output: truss rod

Example Input: Category: boxing terminology 
Words: deck, glove, caution, queen, apron
Example Output:
queen