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.

Example Input: Category: baby animals 
Words: lust, kitten, deer, bambi, fawn
Example Output: lust

Example Input: Category: emotional status 
Words: high quality, fine, annoyed, relaxed, ok
Example Output: high quality

Example Input: Category: physical activity 
Words: fall, duck, swan, hike, get down
Example Output:
swan