Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Q: truss rod, emotional supports, emotional upsets, emotionalities, fret

A: truss rod
****
Q: emotional upsets, emotional supports, down, ashamed, up

A: up
****
Q: board, blind, fold, tko, deck

A:
tko
****