HCA and Student Nurse

Hi all, hope ur well I know this sounds like a silly question but i have trained for 18months as a student nurse and i have to take a break due to personal circumstances but i want to carry on in healthcare and have applied to a number of HCA jobs. My problem is i know they will ask me the difference between the two roles and im struggling with my answer. I understand there is a difference thou!! I Was thinking something like this, a student nurse i was supernurmary and there to Learn, whereas in my role as a HCA i will be assisting the nurse with the care of patients taking direction from the trained nurse. I'm really struggling with my answer as most the time i felt like a HCA as a student nurse!! :s Any help would be great!!! Thanx Guys