Synonyms of linchpin

Noun

1. anchor, mainstay, keystone, backbone, linchpin, lynchpin, support

usage: a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"

2. linchpin, lynchpin, pin

usage: pin inserted through an axletree to hold a wheel on

Definition and meaning of linchpin (Dictionary)