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: chocolate food 
Words: smuggled, brownie, fudge, pudding, truffles
smuggled

Category: outdoor sport activity 
Words: swim, wrestle, fish, canyoning, horse
horse

Category: aesthetic characteristic 
Words: fair, flaxen, well, color, pale

well