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: moral characteristic 
Words: clime, fine, fair, trustworthy, unjust

Answer: clime


Question: Category: aesthetic characteristic 
Words: level, fair, milky, sunny, well

Answer: sunny


Question: Category: bird 
Words: hummingbird, excavator, heron, winch, crane

Answer:
excavator