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

Category: weather 
Words: windy, 70, mild, fair, loyal
loyal

Category: food 
Words: fortitude, meat, cheese, frank, pork

fortitude