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]: current, wave, whirlpool, sea, data sets
[A]: data sets


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


[Q]: crane, concrete pourer, parrot, davit, sandpiper
[A]:
concrete pourer