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: deck, stern, apron, blocking, caution

A: stern
****
Q: spring, run, fall, equinox, autumn

A: run
****
Q: davit, ostrich, steam roller, winch, crane

A:
ostrich
****