When in a user's Access tab in Core > People Finder, the "Roles" listed in bold are actually the users's Persona, and to the right, the roles that fall under that persona.

For example, you may see Student in bold, and this encompasses roles such as Incoming Student, Student, and Past Student. This would be the same for Faculty, where Faculty may be listed in bold, and the user will show roles such as Teacher, Non-Teaching Staff, Coach, etc.

User-added image