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: luke, milky, stormy, fair, warm

A: milky
****
Q: cold, deal, make the grade, unprejudiced, fair

A: unprejudiced
****
Q: concerned, board, nervous, emotional, fret

A:
board
****