Lynchpin
Part of speech: noun
Definition: a pin inserted through holes at the end of an axle, so as to secure a wheel a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
Linchpin
Part of speech: noun
Definition: a pin inserted through holes at the end of an axle, so as to secure a wheela central cohesive source of stability and security; a person or thing that is critical to a system or organisation.