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]: sergeant, lieutenant, fighter, general, ordinary
[A]: ordinary


[Q]: deck, crew, fight, knockout, tko
[A]: crew


[Q]: data sets, dastards, water, do tests, current
[A]:
water