If you want a service to filter and sort domain names by popularity score, One Word Domains is a great option. The service indexes 1,294,245 available and brandable one-word domain names. It indexes 27,625 English words across 93 domain extensions and offers minute-by-minute updates on availability and prices. With filters and sorting by popularity score, it's a good option for startup founders and entrepreneurs.
Another option is NameSnack, an AI-powered business name generator that also offers instant domain search and keyword search. It uses machine learning and keyword combinations to generate a broad range of names for industries like websites, startups, apps and more. It doesn't check trademark databases, but it's good for a quick name if you're willing to pay for it, funded by advertising and commissions on domain name registration.