1. (noun) anchor, mainstay, keystone, backbone, linchpin, lynchpin
a central cohesive source of support and stability
Synonyms: anchorman, key, linchpin, ground tackle, lynchpin, rachis, headstone, grit, sand, anchorperson, spinal column, keystone, guts, back, backbone, pillar, spine, anchor, mainstay, moxie, gumption, vertebral column
2. (noun) keystone, key, headstone
the central building block at the top of an arch or vault
Synonyms: samara, tombstone, tonality, keystone, key, backbone, paint, lynchpin, linchpin, gravestone, winder, headstone, anchor, key fruit, mainstay, cay
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Synonyms for keystone 
