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]: early, water, delayed, history, current
[A]: water


[Q]: data sets, sea, prompt, timely, current
[A]: sea


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