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: down, lower, opposite of up, ground, remorseful

Answer: remorseful


Question: leverage, solid, firm, amalgamated, concerted

Answer: solid


Question: bend, spring, roll, fall, tumble

Answer:
spring