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: cool, unruffled, funny, chill, ethical

A: chill
****
Q: mallet, winch, parrot, winch, crane

A: winch
****
Q: software, sort mail, schedule, schedule appointments, file

A:
software
****