Are Greys Anatomy Characters Doctors or Surgeons?(April Kepner, Arizona)

Are Greys Anatomy Characters Doctors or Surgeons? Because I had some where that surgeons only do surgery and don't really interact with patients in the hospital. However, in greys anatomy they do both? So what jobs do those characters do? Especially April and Arizona? I know April is a trauma surgeon and Arizona is a pediatric surgeon, however they still interact a lot with their patients. What jobs in the hospital are April, Arizona, Jackson?