WordPress and Nova start from opposite assumptions about how much you want to manage yourself, so this comparison, written by Nova and not an independent reviewer, is really about figuring out how much of that management you're signing up for.
WordPress.org, the self-hosted version, gives you full control over a site built on the platform that runs a very large share of the web: you choose your own hosting, install a theme, add plugins for whatever functionality you need, and maintain all of it yourself, including updates and security. WordPress.com, the hosted version, removes some of that maintenance burden and has recently added its own AI website builder, letting you describe your site in plain language and get a generated WordPress site back. Either way, once the site exists you're working inside WordPress's block editor and, if you want more than the basics, its plugin ecosystem, the largest of any website platform, covering nearly anything you could want to add, from booking calendars to membership areas to advanced SEO tools.
Nova doesn't put WordPress underneath your site at all. You describe what you want, see AI-generated previews of the features it's proposing, choose a style, and get a complete, working site with a live preview, publishing to a free getnova.pro subdomain with no account required to build or preview it first. There's no plugin marketplace to browse and no updates to manage, but that also means if you need a specific plugin-driven feature, you'd link out to a separate tool for it rather than installing something directly into the site.
The practical question is how much you want to own versus how much you want handled for you. If you specifically need a plugin for something like a booking system, a members-only area, or a large product catalog, WordPress's ecosystem gives you a path to add that directly to the site. If you'd rather describe a site and get a working result without maintaining a platform underneath it, Nova removes that layer entirely.
In concept, yes, both let you describe a site and get a generated result. The difference is what's underneath: WordPress.com's AI builder still produces a WordPress site with WordPress's editor and plugin system, while Nova's generated site isn't built on WordPress at all.
Not for a basic site, but getting comfortable with its block editor and, if you add plugins, understanding how they interact takes more time than describing a site to Nova and reviewing the result.
WordPress generally offers more long-term flexibility through its themes and plugins, since you can keep adding to a self-hosted site indefinitely; that flexibility comes with more ongoing management than a Nova-built site requires.
Describe your site to Nova and see a working result before deciding whether you want a platform like WordPress underneath it.