"Supervisor" and "manager" are the most common. Less common are any title with the word "lead" such as "team lead" and occasionally titles with the word "senior" such as "senior customer support representative".

From what I know, junior managers are usually your supervisors. But it basically depends on the organization you have. For smaller organizations, the hierarchy is much lower. There might be no middle managers, e.g. from the senior managers next would be the supervisors. For example, you labelled sales/marketing manager as a middle-level manager. Maybe under him, the junior managers are for different product segments or geographical markets the company is serving.