Specialized professions that require a college degree for even entry level work are considered graduate careers. Medical specialists such as doctors must complete college as well as a medical degree to practice. They are therefore considered a graduate career. Lawyers, upper-level educators and pharmacists are all careers where entry level candidates are either expected or required to obtain a degree before their career can begin.
There are careers where one can obtain an entry level position without a degree, but they are still considered graduate careers. The world of finance is one place where this is true. Entry level jobs have been available to those who have not yet gotten a degree, but will in the future. They cannot advance without obtaining their degree. Over time, these graduates are often groomed for promotion to leadership positions where a degree will be a necessity, and their training will not start until they have procured a degree in their field.