instruction:
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: employment activity 
Words: recruit, replace, sack, heat, fire
answer:
heat


question:
Category: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive
answer:
refreshing


question:
Category: bird 
Words: mallet, winch, parrot, winch, crane
answer:

winch