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Favorite Answer
A castle is where royalty resides whereas a fort is a military structure.
Anonymous
A castle is where a rich person and family dwell (not royalty. Those live in palaces)
A fort(ress) is for military purposes only
Son of T3
There is a good summery of the two at the reference (easy web search).
Bill
There are many forts in the US, but few castles. Here is one near Lexington, Ky. https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.simplemost.com%2Fwp-content%2Fuploads%2F2018%2F03%2FScreen-Shot-2018-03-28-at-9.35.33-AM-750x500.png&imgrefurl=https%3A%2F%2Fwww.simplemost.com%2Fkentucky-castle%2F&tbnid=h2lrmyTayA4BJM&vet=1&docid=6aJYuc_6kKjvSM&w=750&h=500&q=Lexington%20ky%20castle&source=sh%2Fx%2Fim
Old Man Dirt
English and French.
Castle is an English word. Fort is derived from a French word.