Tenant Admin has privileges to operate across all the assets belonging to the Subscription or Tenant. Tenant Admin can manage Projects (create, delete etc.) and manage Users on the system. A Tenant Admin is created when you sign up for accelQ subscription, who can then setup other projects, project admins etc.
Project Administrator can configure a project that he or she is assigned to. Project customization and management are part of the privileges. Users can be assigned or de-assigned from the Project and other users can be assigned as Project Admins.