Circuit board and Electric circuit

Circuit board noun - A printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities.

Electric circuit and circuit board are semantically related. In some cases you can use "Electric circuit" instead a noun phrase "Circuit board".

Electric circuit noun - An electrical device that provides a path for electrical current to flow.

Circuit board and electric circuit are semantically related. You can use "Circuit board" instead a noun phrase "Electric circuit".