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: animal 
Words: train, fly, jump, leap, grasshopper

Answer: train


Question: Category: moral characteristic 
Words: concise, frank, matter of fact, pork, blunt

Answer: pork


Question: Category: bird 
Words: crane, tackle, mallet, dump truck, hoist

Answer:
dump truck