Potential exception: "Adult." Arguably because it generally isn't a verb when emphasis is on the second syllable, some people do that even when it's a noun.

I'm an Adult vs. I'm an aDULT. *

Use as of "adult" as a verb is non-standard and where to emphasise that is even less clear-cut for those of us who put the emphasis on the first syllable of the noun. Interestingly, "adulterate" is less strange as a verb and the emphasis is definitely on the second syllable there.

We could tie ourselves in knots analysing the late emphasis form as a verbified noun, re-nounified. Ow.

* The underlying truth of said statement is irrelevant. Chronologically, I have been one for some time. Mentally... ehh.