How do we deal with wording that is wrong or ambiguous?
Particularly when the mistake is a very common one, or a widely miss-understood one.

For example, the question on water in a vacuum, someone said it would boil, when really it would evaporate. These two words mean different things in physics, but as a common miss-conception they are the same.

How should we deal with this / correct it in a way that doesn't offend the people involve, but also doesn't perpetuate these miss-conceptions further?