Headstone and Keystone

Headstone noun - The central building block at the top of an arch or vault.

Keystone is a synonym for headstone in cornerstone topic. In some cases you can use "Keystone" instead a noun "Headstone", when it comes to topics like gravestone.

Keystone noun - The central building block at the top of an arch or vault.

Headstone is a synonym for keystone in base topic. You can use "Headstone" instead a noun "Keystone", if it concerns topics such as cornerstone. popular alternative