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: flat, level, mansion, smooshed, elevation

Answer: mansion


Question: dump truck, tackle, crane, duck, mallet

Answer: dump truck


Question: excavator, digger, crane, steam roller, egret

Answer:
egret