Can you answer this elementary school problem?

AviatorTom
Can you answer this elementary school problem?

The teacher who gave this problem to her students says the correct answer is silver, because it's the only one that isn't a noun, it's an adjective.

Excuse me... does she not know that silver is a metal... and a noun?

Parents were stumped by this problem, and gave legitimate reasons why every word could be the odd one out.

What would you choose as the odd one out? There are no right nor wrong answers, if you can justify your choice.

FYI... I would choose toothbrush, for two reasons: it's the only compound word, and the only one that doesn't have an "e" in it.

Can you answer this elementary school problem?
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