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: happy, substance, shop, tools, content

A: happy
****
Q: crane, winch, mallet, winch, flamingo

A: winch
****
Q: down, emotionalities, emotional state, downward, emotional

A:
downward
****