"realms" in the noun sense
1. kingdom, land, realm
a domain in which something is dominant
"the untroubled kingdom of reason"
"a land of make-believe"
"the rise of the realm of cotton in the south"
2. kingdom, realm
the domain ruled by a king or queen
3. region, realm
a knowledge domain that you are interested in or are communicating about
"it was a limited realm of discourse"
"here we enter the region of opinion"
"the realm of the occult"
Source: WordNet® (An amazing lexical database of English)
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