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: food 
Words: provision, frank, hot dog, goodies, harsh

Answer: harsh


Question: Category: direction 
Words: south, loveful, down, left, falling

Answer: loveful


Question: Category: outdoor sport activity 
Words: swim, iguana, fish, hike, hunting

Answer:
iguana