Another word for domain could be area, arena or field. You can also use sphere, land or world, depending on the context.
Realm and domain
Yes, the noun 'invasion' is an abstractnoun; a word for an unwelcome intrusion into another's domain; an incursion by a large number of people or things into a place or sphere of activity; a word for a concept.
As far as the king could see, all of the lands were his domain. The domain name had changed for the website. Eminent domain allows governments to buy or seize lands from private owners.
Inventions on which patents have expired become part of the public domain. National parks are part of the public domain of the United States.
DNS stands for Domain Name System.
Realm and domain
Another word for region is area zone, district, domain, environs, locale, sector, territory, vicinity...
No, domain is a noun.
Collision domain
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Another name for domain is Internet web site. A domain is a specific location on the Internet. Persons wanting to get to a particular domain will have to know the web site address.
Community, democracy, dominion, empire, monarchy, sovereignty, realm, republic, society, domain or land.
The woods are her domain. The domain name is written at the top of the page.
Domain refers to the value(s) X can be. I suppose "another name" could be "X value."
Domain forwarding is when you make one domain "example1.com" automatically forward a user to another domain "example2.com" in a DNS server.
Domain is used to refer to the x (or the independent variable).
Other names for Y value