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

Answer: pork


Question: Category: direction 
Words: down, backward, up, downward, shameful

Answer: shameful


Question: Category: social gathering 
Words: roll, convention, meeting, bar, club

Answer:
roll