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: secretary duty 
Words: file, software, schedule, support, order office supplies
Example Output: software

Example Input: Category: ocean 
Words: signal, timely, brine, flow, current
Example Output: timely

Example Input: Category: boats 
Words: dock, deck, sail, draw, stern
Example Output:
draw