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: boxing terminology 
Words: deck, gunwale, level, tko, jab
Example Output: gunwale

Example Input: Category: construction 
Words: dump truck, swift, crane, upraise, windlass
Example Output: swift

Example Input: Category: animal 
Words: jog, fly, pounce, bats, ant
Example Output:
jog