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: sack, inferno, promote, empower, fire

Answer: inferno


Question: Category: physical activity 
Words: trip, jump, fall, equinox, exercise

Answer: equinox


Question: Category: emotional status 
Words: fret, neck, anxious, emotional supports, emotionalities

Answer:
neck