What’s a Good Free (or Near Free) SEO Search Tool for Starting a Blog on the Cheap?

My name is Philip Carpenter, and I aim to make a blog on all matters war & peace; to that end I need an SEO search tool that won’t censor data over all things violence like Ubersuggest does, and I also need the tool to either be free, or at least around Ubersuggest’s $30 price point. So what exactly is available for showing me keyword density and monthly volume, in particular? WordPress ...