Breakneck and Speedball

Breakneck adjective - Moving, proceeding, or acting with great speed.

Speedball and breakneck are semantically related In some cases you can use "Speedball" instead an adjective "Breakneck".

Breakneck and speedball are semantically related in speedy topic. You can use "Breakneck" instead an adjective "Speedball", if it concerns topics such as very fast, quick in movement.