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]: fly, flutter, bus, drive, fish
[A]: fish


[Q]: sergeant, general, standard, plain, ordinary
[A]: sergeant


[Q]: united, synergy, leverage, inflexible, firm
[A]:
inflexible