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: animal 
Words: cockroach, leap, drive, swim, fly
drive

Category: direction 
Words: right, descending, down, opposite of up, emotional supports
emotional supports

Category: mode of transportation 
Words: eagle, flutter, fly, swim, train

eagle