Identification and spice level?

I received a bag of homegrown peppers as a gift, they named off a few names of the peppers. However I need help identifying which pepper is which and their spice level would be helpful as well.
They said the bag contains: Ghost Pepper, habanero, and cayenne peppers.
I know the two in the right are jalepenos and banana peppers, I just do not know which of the others is which.