Bottom and Mainspring

Bottom noun - The side or part facing downward from something.

Mainspring and bottom are semantically related in basis topic. In some cases you can use "Mainspring" instead a noun "Bottom", when it comes to topics like base.

Nearby Words: bottomless, bottomed, bottommost, bottomland, bottoming

Mainspring noun - The most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism.

Bottom and mainspring are semantically related in base topic. Sometimes you can use "Bottom" instead a noun "Mainspring".