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: fib, replace, falsification, molasses, fudge
molasses

Category: animal 
Words: fish, iguana, canyoning, hamster, horse
canyoning

Category: aesthetic characteristic 
Words: exquisite, dull, high quality, fine, acceptable

acceptable