A custom name server allows you to run your own name server to respond to DNS requests for your domains. ... Shared and Reseller hosting customers can achieve this same branding affect for their domains by instead setting up vanity name servers.
Register your name server's IP address to a name. ... Delegate your domain to the names you just created. At NameCheap, you would go General > Domain Name Server setup, and Specify Custom DNS Servers. Then, enter the two (or more) names you just created “nsX.domain.com”.
A DNS server and “name server” are the same thing. The acronym DNS means Domain Name Service, Domain Naming System, or Domain Name System, depending on whom you talk to, but it's all the same thing.
