What special infected zombie can you be when you Left 4 Dead and when you go to scavenger or verses

In both modes you could play as the :
Hunter
Smoker
Boomer
Tank (If you are lucky enough to be chosen to be him when he comes out)

There is a special infected that you cannot play as :
Witch (The crying woman that startles when you go near)

Additional info :
The Hunter can pounce onto survivors and pin them down, he will stab you with his fingers to death or be killed by other survivors.

The Smoker can strangle you with his long, rope-like tongue and if you are unlucky, he might pull you to a high ledge where if you are pulled you die instantly. Other survivors must help you to escape.

The Boomer will puke some bile on you which attracts the horde (The weak, normal zombies) and on death, he explodes and anyone near him will be covered in Boomer Bile, it will also have a blinding effect, you could not see too well if you are covered in Boomer Bile.

The Tank is big, and each punch will make you fly, if you are unlucky, especially on the Hospital Rooftop, he will punch you out of the map, thus killing you instantly. He could also punch cars and other debris that could incapacitate you instantly, he could also throw rocks at you by clicking the right button of your mouse.

The witch, she crys, she always does, and if you go near her or make noises at medium range, or put your flashlight on her? Start prayin' and run like hell. She runs the fastest of all infected kinds, and once she is startled, she will charge at you, and one scratch on you? You're incapacitated (If on expert you die instantly), and she will keep scratching you (Surprisingly fast) till death, it won't take her too long though, so you have to kill her as fast as you could.

There was a cut-out infected who was supposed to be in the game but eventually was dropped out.

The Screamer, he was supposed to act somewhat like Boomer, if he sees you, then he would moan aloud, calling a shitload of zombies, much more than a Boomer Bile would, but this was eventually dropped, I forgot the reason though.