realm

A community or territory over which a sovereign rules; a kingdom.

An area or sphere, as of knowledge or activity: synonym: field.

A royal jurisdiction or extent of government; a king's dominions; a kingdom.

Figuratively, a jurisdiction or domain in general; a sphere of power, influence, or operation; province; arena.

In zoögeog., a prime division of the earth's surface; a faunal area of the largest extent; a zoölogical region of the first order.