It is almost impossible to sex an angel until they start breeding. Then and ONLY then can you be 100% sure what you have.
I think you mean nuchal hump and as Star_Rider already said, when it comes to angelfish, there are females that have a nuchal hump.The head bump is called a bucchal hump and is usually found in matured males (after several years). I do not see that in your pictures.
Charlie