General synonyms:
* Realm: This is a very close synonym, often used in a more poetic or formal context.
* Domain: This emphasizes the area ruled over.
* Sovereignty: This emphasizes the supreme power of the ruler.
* Nation: This is similar to kingdom, but can also refer to a country with a more modern form of government.
* State: This is a more general term for a political entity, but can also refer to a kingdom.
* Empire: This suggests a larger, more powerful kingdom that has conquered other lands.
More specific synonyms:
* Monarchy: This specifically refers to a kingdom ruled by a monarch.
* Principality: This refers to a kingdom ruled by a prince.
* Duchy: This refers to a kingdom ruled by a duke.
* Crown: This can refer to the kingdom itself, or to the ruling family.
Figurative synonyms:
* Paradise: This suggests a perfect or ideal kingdom.
* Haven: This suggests a safe and peaceful kingdom.
* World: This is a general term for the entire universe, but can also refer to a kingdom in a more metaphorical sense.
The best word to use will depend on the specific context and the nuance you want to convey.