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.
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Question: Category: employment activity 
Words: recruit, replace, sack, heat, fire

Answer: heat


Question: Category: poker 
Words: level, blind, pack, draw, deck

Answer: level


Question: Category: animal 
Words: shark, dolphin, fish, hunting, cat

Answer:
hunting