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.

[EX Q]: nervous, frustrated, fret, jack, concerned
[EX A]: jack

[EX Q]: pounce, car, bats, fly, grasshopper
[EX A]: car

[EX Q]: hummingbird, crane, ostrich, excavator, parrot
[EX A]:
excavator