Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
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Question: Category: construction 
Words: excavator, steam roller, concrete pourer, swallow, crane

Answer: swallow


Question: Category: construction 
Words: dump truck, swift, crane, upraise, windlass

Answer: swift


Question: Category: emotional status 
Words: loveful, falling, melancholy, emotional upsets, down

Answer:
falling