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]: hunt, fish, stingray, dolphin, bat
[A]: hunt


[Q]: angular momentum, fat, calcium, brittleness, ugly
[A]: calcium


[Q]: head, hull, knockout, deck, dock
[A]:
knockout