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]: ice, let go, fire, sack, replace
[EX A]: ice

[EX Q]: hot, optimist, cool, calm, relaxed
[EX A]: hot

[EX Q]: cockroach, pounce, fly, fish, flutter
[EX A]:
flutter