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: open-faced, team, roll, doorstep, club
team

Category: temperature 
Words: cold, hot, cool, popular, relaxing
popular

Category: bird 
Words: dump truck, hummingbird, swift, crane, ostrich

dump truck