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: emotional status 
Words: truss rod, emotional supports, emotional upsets, emotionalities, fret
truss rod

Category: boats 
Words: bridge, deck, stern, dock, suits
suits

Category: police punishment 
Words: wispy, penalty, fine, money, neat

neat