Solution

REALM

3 clues

Domain

Word class: Common noun
Nature of clue: Synonym
Difficulty: Easy
Sources: Boatload Puzzles

Other solutions to Domain

Kingdom

Word class: Common noun
Nature of clue: Synonym
Difficulty: Very easy
Sources: Boatload Puzzles
Topics: History, Politics

Royal domain

Word class: Common noun
Nature of clue: Description
Difficulty: Easy
Sources: Boatload Puzzles
Topics: History, Politics

Words are categorized by artificial intelligence: there can be mistakes.