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]: fearful, content, substance, program, thing
[EX A]: fearful

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

[EX Q]: glass, plate, metal, panel, fiberglass
[EX A]:
plate