Realm n. : A royal jurisdiction or domain; a region which is under the dominion of a king; a kingdom.

Realm n. : Hence, in general, province; region; country; domain; department; division; as, the realm of fancy.

Example:
What Realm would you recommend for Warhammer Online?

Taxonomy
Realm, kingdom, monarch, free encyclopedia, reich, king, Danish Realm, the United Kingdom, territories, Realm of Sweden, Danish Kingdom, Realm of New Zealand, common monarch, German, suffix, search, meanings, free dictionary.

Defination from the web:
realm (pronounced /rɛlm/) is a dominion of a monarch or other sovereign ruler. ... "Realm" is particularly used for those states whose name includes the word kingdom (for example, the United Kingdom), to ... Likewise, the Faroe Islands and Greenland remain parts of the Danish Realm. ...