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: location (proximity) 
Words: beside, close, steady, nearest, nearer

Answer: steady


Question: Category: body part 
Words: inch, head, foot, ear, finger

Answer: inch


Question: Category: bird 
Words: excavator, parrot, crane, hummingbird, tackle

Answer:
excavator