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.

Category: bird 
Words: dump truck, pelican, goose, crane, derrick
dump truck

Category: weather 
Words: brisk, ghostly, windy, fair, deal
ghostly

Category: aesthetic characteristic 
Words: warm, level, well, fair, color

warm