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: police punishment 
Words: money, fine, ticket, level, suspension
Example Output: level

Example Input: Category: measurement unit 
Words: centimeter, leg, mile, meter, foot
Example Output: leg

Example Input: Category: guitar part 
Words: neck, fret, string, headstock, anxious
Example Output:
anxious