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: emotional status 
Words: down, melancholy, below, loveful, kind
below

Category: activity 
Words: spend, divide, apple, whittle, fritter
apple

Category: construction 
Words: dump truck, crane, davit, derrick, hoist

derrick