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, emotional state, emotional supports, miserable, falling
falling

Category: elements 
Words: ice, air, fire, hire, combustion
hire

Category: physical property 
Words: large, fat, capacitance, calories, ugly

calories