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: type of sandwich 
Words: roll, hoagie, bacon, club, community

Answer: community


Question: Category: moral characteristic 
Words: just, alright, ok, fair, size

Answer:
size