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: nutritional value 
Words: vitamin c, salt, sugar, fat, big boned
big boned

Category: type of sandwich 
Words: clan, lettuce, bacon, club, submarine
clan

Category: accomodation 
Words: plane, duplex, house, cabin, flat

plane