castle – le château
(Pronounced sha-toh)
To remember that castle is pronounced sha-toh (château) in French, use the following mnemonic.
She lived in a castle, while I lived in a shack with the toads (château).

Examples of château (castle) in a sentence
Nous avons visité un beau château en France.
(We visited a beautiful castle in France.)
Je veux habiter dans un château.
(I want to live in a castle.)
Il y a un vieux château fort sur la colline.
(There is an old fortified castle on the hill.)