Dear WW: This distinction between words is an excellent example of what I woulld like to see more of in AWADtalk.
I had not noticed the difference before, because, of course,
I have never been either envious or jealous. What, never? No, never. So jealousy involves a rivalry, envy does not.
And if one has several rivals, they could be thought ogf as fungible. It would be fun to turn them into giblets.