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: location (proximity) 
Words: beside, closest, close, adjacent, shut
Example Output: shut

Example Input: Category: boats 
Words: hull, deck, rudder, check, lifeline
Example Output: check

Example Input: Category: guitar part 
Words: fingerpick, worried, fret, strap lock, chord
Example Output:
worried