There are plenty of fancy domain search websites and tools available online these days. Would you like to add a domain checker to your own site? Instant Domain Checker for WordPress may be just the plugin for the job. It integrated with WHMCS and WooCommerce and suggests domains as you start typing.
The plugin uses reCAPTCHA to tackle abuse. It is responsive and mobile friendly. Your visitors can use this tool to check domain names on your site. Top-level and country-code top-level domains are supported. Users have the option to change number of extensions to check, text, Whois, and other settings from the General Settings tab.
Instant Domain Checker comes with a Visual Composer shortcode. It is a commercial plugin by an Elite Author.