Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Q: pack, hearts, deck, queen, rudder

A: rudder
****
Q: doughnut, fritter, fried, pie, seperate

A: seperate
****
Q: fret, jack, sad, worried, concerned

A:
jack
****