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: ocean 
Words: current, wave, whirlpool, sea, data sets
data sets

Category: poker 
Words: call, sail, deck, board, queen
sail

Category: emotional status 
Words: acceptable, fine, calm, pretty, relaxed

pretty