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: shady activities 
Words: banned, replace, smear, chocolate cake, fudge
chocolate cake

Category: guitar part 
Words: neck, strap lock, fret, angry, notes
angry

Category: physical property 
Words: large, big, chunky, fat, area

big