Every name in the DNS tree is a domain, even if it is terminal, that is, has no subdomains. Every subdomain is a domain and every domain except the root is also a subdomain.

He's very neighborly: he always collects my mail when I'm away on vacation.

Other species considered occasional migrants have become established in the UK in recent years, such as the ... sombre brocade, Blair's mocha, Flame brocade, and Clifden nonpareil.

the blood-red cardinal acrobating about in his holly bush