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]: hull, galley, deck, lifeline, tko
[A]: tko


[Q]: fine, prime, firstrate, custody, ok
[A]: ok


[Q]: hunting, camp, kayak, fish, shark
[A]:
shark