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


[Q]: brownie, fudge, wrongful, mangle, loosen
[A]: brownie


[Q]: fawn, love, flatter, colt, cajole
[A]:
colt