What is another word for linchpin?
Pronunciation: [lˈɪnt͡ʃpɪn] (IPA) 
A linchpin is defined as a crucial element or person that holds something together. There are many synonyms for linchpin, such as cornerstone, keystone, foundation, backbone, anchor, mainstay, nucleus, and pivot. Each of these words convey the importance of something in keeping a structure or system intact. For example, a keystone is the central stone in an arch that locks the other stones in place, while a backbone provides support and stability to an organism. Similarly, an anchor secures a ship in place, while a pivot is the point around which something turns or revolves. Regardless of the synonym used, the concept remains the same: without a linchpin, the entire structure or system would collapse.
