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: poker 
Words: fold, suits, deck, sail, hearts
sail

Category: ocean 
Words: signal, timely, brine, flow, current
timely

Category: physical property 
Words: bulky, angular momentum, pasty, fat, big

big