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: season 
Words: winter, roll, spring, hiems, fall
Example Output: roll

Example Input: Category: aesthetic characteristic 
Words: there, ticket, fine, dull, level
Example Output: ticket

Example Input: Category: animal 
Words: bird, grasshopper, fly, spider, flutter
Example Output:
flutter