What do we call the equivalent of a subreddit?
Sublemmy doesn’t quite roll off of the tongue as nicely.
Reddit wants you to call them communities too, but most people still call them subreddits or subs.
Communities - they’re abbreviated to /c/ and that seems a pretty consistent term.
They are called communities or coms for short on Lemmy, and they’re magazines or mags on Mbin/Kbin.
I usually will say or type “community”.
You just answered your own question in the title, you call them communities. It’s what they are called by the Lemmy-UI software, and also why they have the /c/ prefix in their URLs.