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: type of sandwich 
Words: meeting, bacon, submarine, toast, club
meeting

Category: weather 
Words: windy, stormy, fair, tone, tangle
tone

Category: boats 
Words: head, hull, knockout, deck, dock

knockout