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: kitchenware 
Words: glass, colander, dish, plate, panel
panel

Category: physical property 
Words: brittleness, large, fat, area, calcium
calcium

Category: type of sandwich 
Words: club, cinema, hero, lettuce, blt

cinema