Buckboard and Caisson

Buckboard noun - An open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles.

Caisson and buckboard are semantically related. in vehicle topic. In some cases you can use "Caisson" instead a noun "Buckboard", when it comes to topics like cart.

Caisson noun - A chest to hold ammunition.

Buckboard and caisson are semantically related. Sometimes you can use "Buckboard" instead a noun "Caisson".