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]: happy, substance, shop, tools, content
[A]: happy


[Q]: crying, concerned, pick, emotionalities, fret
[A]: pick


[Q]: rich, tart, cake, replace, fudge
[A]:
replace