queendom; country ruled by a queen
Refers to a nation or territory where a queen is the sovereign. Not a common everyday word, but used in historical or fantasy contexts.
The story is set in an ancient queendom.
A country ruled by a queen is sometimes called a queendom.
帝国 means 'empire', ruled by an emperor or empress, typically larger and more complex than a queendom.
Compound of 女王 (queen) + 国 (country). The reading じょおうこく follows standard on'yomi readings for the kanji.