Hunchback is an old noun for a person whose back is high and rounded because the spine curves in an unusual way. Dictionaries still list it, but it is offensive as a name for a person. Use it only when you need to understand an old story title; do not use it about a real person. If you need to mention the body, talk about a hunched back or a curved spine — the back, not the whole person as the condition. The noun was cut from the older adjective hunchbacked (the adjective came first). Though actually, even calling a person hunchbacked can hurt; kindness is to name the person first, and the back only if it matters.