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.
--------
Question: Category: ocean 
Words: flow, current, course, moon, dastards

Answer: dastards


Question: Category: guitar part 
Words: neck, strap lock, fret, angry, notes

Answer: angry


Question: Category: secretary duty 
Words: type, fax, file, sort mail, ram

Answer:
ram