Lynchpins are essential components that hold something together. Some synonyms for lynchpins include key, cornerstone, linchpin, pivot, central point, keystone, foundation, nucleus, heart, and anchor. These words all convey the significance of a critical element in making something functional and whole. A lynchpin or key, for example, is often the piece that unlocks or opens up a system. The cornerstone and foundation are the basis or grounding for something larger, while the pivot and keystone are critical turning points that everything else hinges upon. The heart, nucleus, and anchor are similarly important and centrally located components that provide stability and support.