There are many uses of both words. Some are nearly the same.
I envy my brother (because he is wealthy).
I envy my brotherâs wealth.
I envy his wealth. (So even though by default you envy a person, we often leave that out. I may not really envy him - I just wish I had his wealth.)
I envy him his wealth. (I envy him because of his wealth. I wouldnât favor this construction over the others, but you will hear it)
Iâm jealous of my brother (because he is wealthy)
Iâm jealous of his wealth.
Iâm jealous of him.
Iâm jealous of him his wealth. (No. That construction would only be used for âenvyâ)
As a noun, âenvyâ is a little higher register.
Envy is a sin. (Yes)
âBeing jealous is a sin. â Or âJealousy is a sin.â (Not really)
Half the women I work with have a crush on me. My wife is constantly jealous. (Different than envy. Not expressing that she wants what I have, but rather that she doesnât want me to receive romantic interest from others.)