Synonym for keystone

noun - a central cohesive source of support and stability

Synonym for keystone

backbone linchpin lynchpin mainstay anchor

Associated with keystone

noun - basis

Synonym for keystone

basis principle core crux ground source spring root motive cornerstone lynchpin mainspring fundament quoin

noun - the central building block at the top of an arch or vault

Synonym for keystone

Associated with keystone

arch building block coign coigne quoin

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