Within the Knowledge Base articles, these objects are referred to as:
For example, the Advertiser account type on your platform may be called "Media Channel", "Business Line" or "Product". And the Publisher account type may be called "Media Tactic", "Vendor", or "Affiliate".
See Publisher Also Known As and Advertiser Also Known As for common object aliases used across the platform.
A user with a "Network" account type has visibility across the entire platform. A "Super" Network user can be thought of as an Admin user.
A user with an "Advertiser" account type has visibility limited to only those call campaigns created under their account. You can think if it as a way to segment ownership of campaigns.
A user with a "Publisher" account type has visibility limited to calls for only campaigns that they are joined to.
Calls can be attributed to an Advertiser, Publisher and campaign making for powerful summary level reporting.