linchpin

Words with a similar base: linchpin

[anchor.n.02] as in: a central cohesive source of support and stability

[linchpin.n.02] as in: pin inserted through an axletree to hold a wheel on

					linchpin (English)
└── lynspin (Middle English (1100-1500))
    └── lynis (Old English (ca. 450-1100))

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