instruction:
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.
question:
crew, board, deck, rudder, hull
answer:
board


question:
ounce, foot, kilometer, milimeter, heel
answer:
heel


question:
steam roller, digger, crane, derrick, tackle
answer:

derrick