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: ocean 
Words: flow, current, course, moon, dastards
Example Output: dastards

Example Input: Category: employment activity 
Words: fire, hire, ground, pay, retire
Example Output: ground

Example Input: Category: poker 
Words: cards, gunwale, pack, deck, draw
Example Output:
gunwale