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]: streamline, sustainability, private, firm, stiff
[EX A]: stiff

[EX Q]: windlass, hummingbird, neck, crane, duck
[EX A]: windlass

[EX Q]: unlicensed, wrongful, tart, banned, fudge
[EX A]:
tart