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: content, books, thing, program, jealous
Example Output: jealous

Example Input: Category: secretary duty 
Words: organize, support, text, sort mail, file
Example Output: text

Example Input: Category: employment activity 
Words: praise, remove, empower, air, fire
Example Output:
air