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: animal 
Words: trap, dog, fish, tiger, horse
trap

Category: police punishment 
Words: suspension, arrest, classy, custody, fine
classy

Category: animal 
Words: grasshopper, fly, swim, dangle, jog

jog