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.
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Question: duck, cat, stoop, swan, goose

Answer: stoop


Question: vodka, spider, gin, blackjack, go fish

Answer: vodka


Question: sad, melancholy, backward, down, emotional upsets

Answer:
backward