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.
--------
Question: Category: type of sandwich 
Words: picnic, open-faced, club, grilled cheese, lettuce

Answer: picnic


Question: Category: activity 
Words: fried, spend, whittle, waste, fritter

Answer: fried


Question: Category: animal 
Words: iguana, dog, whale, hunt, fish

Answer:
hunt