What is your search scope here? I'm not clear on that at a glance, as a non dev user of the fediverse.
As an American, personally, I wish we could start calling it community-ist when it is not overtly political. I have no problems with diverse political ideologies. In English in the USA there is a lot of dogma attached to the words communist and socialist that fails to resonate with otherwise moderately intelligent people. "Community-ist" absolutely forces an English speaker to say they are anti-community to oppose it and therefore implies they need to rethink socialism and communism to some extent helping to reverse dogma.
Anyways, good luck with the project.
But anarchism is the opposite of all governance while authoritarianism is a subset.