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.

Category: police punishment 
Words: suspension, exquisite, prime, fine, flyaway
exquisite

Category: type of sandwich 
Words: clan, lettuce, bacon, club, submarine
clan

Category: emotional status 
Words: substance, angry, nervous, content, happy

substance