A mistake people often make both in speech and writing is using Calvary when they mean cavalry. This is one I find surprising, since to me the words sound quite different. After all, people don’t mistakenly say calvarier for cavalier. Here are the definitions.

Calvary: a site near Jerusalem where Jesus was crucified. It is also known as Golgotha.

Cavalry: soldiers who fight mounted on horseback. In modern armies it refers to those fighting in tanks or similar fast-moving land vehicles. A cavalier is such a cavalry soldier.