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: brownie, loosen, chocolate cake, fudge, molasses
loosen

Category: ocean 
Words: flow, current, course, moon, dastards
dastards

Category: moral characteristic 
Words: decent, honorable, unjust, raining, fair

raining