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: emotional display 
Words: buck, identity, culture, fawn, pester
buck

Category: fried food 
Words: sweet roll, seperate, fritter, dunker, dumpling
seperate

Category: type of sandwich 
Words: clan, club, toast, dagwood, submarine

clan