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]: heron, davit, egret, derrick, crane
[A]: davit


[Q]: neat, beautiful, dull, fine, firstrate
[A]: firstrate


[Q]: backward, south, disgusted, down, falling
[A]:
disgusted