Windows is more popular compared to macOS. Plus, it's affordable and gives more tools to develop websites. macOS becomes necessary if you wish to develop apps for iOS or other apple systems. Else, you can make a web app in any language using Windows. So, I think Windows wins in this.

This is great to know! Wordpress has been the best website builder. Coding is a tedious process for many people and that's why they approach easy methods to build a website. There are many website builders like Weebly, Wix, Squarespace and now Webflow. I haven't used it yet. But, I would like to try Webflow to make a responsive and robust website.

WebAssembly’s FAQ page agrees: “WebAssembly minimizes costs by having a design that allows (though not requires) a browser to implement WebAssembly inside its existing JavaScript engine (thereby reusing the JavaScript engine’s existing compiler backend, ES6 module loading frontend, security sandboxing mechanisms and other supporting VM components). Thus, in cost, WebAssembly should be comparable to a big new JavaScript feature, not a fundamental extension to the browser model.” Both cannot replace each other because both have unique pros and cons. But, ultimately, it depends on the web developer's choice.

If you want to go with the dictionary API, you can select Oxford Dictionaries API . For generating random words, WordsAPI is also a better option. Hope it's useful.