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This might be slightly related list, although its not for Gmail, but for Google Groups for G Suite:

https://support.google.com/a/answer/6093413?hl=en

Reserved group names:
We reserve certain names that cannot be used if you are creating a group using Google Groups or Google Groups for Business. However, you can use these names if you are creating a group using the Groups control in the Admin console.

abuse
admin
administrator
hostmaster
majordomo
postmaster
root
ssl-admin
webmaster

The names abuse and postmaster are reserved. You can, however, subscribe to them and receive all mail sent to these addresses.