You can also check the popularity of any keyword on the trends page: https://dofo.com/trends/keyword/coin
It says, how popular is the keyword, how many registered domain names exist with that keyword, what percentage of these domain names are used actively as a website and more.
As for the registrars; yes Godaddy is the first one with about ~70 million domain names under management and Namecheap and Tucows are following it: https://dofo.com/registrars
By using dozens of filters, you can refine the results and see whatever you want.
For example, 66,237 .com domain names contain "coin" and are listed for sale on marketplaces: https://dofo.com/search/?contains=coin&on_sale=y&extension=c...
You can also check the popularity of any keyword on the trends page: https://dofo.com/trends/keyword/coin It says, how popular is the keyword, how many registered domain names exist with that keyword, what percentage of these domain names are used actively as a website and more.
As for the registrars; yes Godaddy is the first one with about ~70 million domain names under management and Namecheap and Tucows are following it: https://dofo.com/registrars
Disclaimer: I'm the co-founder of dofo.com