As nouns the difference between kingdom and duchy
is that kingdom
is a nation having as supreme ruler a king and/or queen while duchy
is a dominion or region ruled by a duke or duchess.
A nation having as supreme ruler a king and/or queen.
(biology, taxonomy) A rank in the classification of organisms, below domain and above phylum; a taxon at that rank (e.g. the plant kingdom, the animal kingdom)
* animal kingdom
* Kingdom of Heaven
* kingdom come
* Kingdom County
* plant kingdom
* vegetable kingdom
A dominion or region ruled by a duke or duchess.
* A Grand Duchy may be a self-governing state.
* A simple duchy tends to be a part of a larger kingdom or empire.