lynchpin

lynch·pin  (lnchpn)

n.

Variant of linchpin.

Thesaurus

Noun	1.	lynchpin - 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" backbone, keystone, linchpin, mainstay, anchor support - something providing immaterial assistance to a person or cause or interest; "the policy found little public support"; "his faith was all the support he needed"; "the team enjoyed the support of their fans"
	2.	lynchpin - pin inserted through an axletree to hold a wheel on linchpin pin - a small slender (often pointed) piece of wood or metal used to support or fasten or attach things

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lynchpin linchpin

noun driving force, director, chief, principal, co-ordinator, cornerstone, mainstay He's the lynchpin of our team.