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: direction 
Words: below, backward, melancholy, down, ground
melancholy

Category: animal 
Words: fish, waggle, fly, dangle, glide
glide

Category: moral characteristic 
Words: frank, provision, brash, courage, integrity

provision