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: guitar part 
Words: fret, concerned, jack, notes, amp

Answer: concerned


Question: Category: widespread 
Words: average, typical, common, general, admiral

Answer: admiral


Question: Category: employment activity 
Words: ice, let go, fire, sack, replace

Answer:
ice