"fediverse" isn't correct either - it's too broad. Kbin and Lemmy post to a part of the fediverse - the "threadiverse". Meanwhile job in can also post to the microblogverse connecting with Mastodon. And there is not one fediverse - ir is both separated by different algorithms for different bits and also within areas some bits federate with others.
If you want a good term for the threadiverse, then Feddit seems like a good catch all name?