Ask Marilyn: What Do These Words Have in Common?

Mike Gallagher of Bayonne, New Jersey, writes:

Marilyn: I've been wanting to send this for years, and I now finally have. What do the following dozen words have in common, other than containing four letters: CANE, CODE, DEAL, GAIN, MAIL, MIND, MODE, PAIN, VAIN, WADE?

Marilyn responds:

What do you think, readers? The answer will appear tomorrow.