How Codeine, hydrocodone , oxycodone and pholcodeine differs?

Hello Dr Ranjan Sir

Can you please tell

How Codeine, hydrocodone , oxycodone and pholcodeine differs?

And what is Ethylmorphine ?

Hydrocodone, Oxycodone and pholcodine are derivatives of codeine, thebaine and morphine respectively. They are quite similar in their analgesic and antitussive effect.

Ethylmorphine is a derivative of morphine and has same uses as above drugs.