Word

keystone, n.
(keystones)

the central building block at the top of an arch or vault
<noun.artifact>

headstone key keystone

semantic pointers

part holonym

arch

hypernym

building block

hyponym

quoin, coign, coigne

a central cohesive source of support and stability
<noun.cognition> freq. cnt.: 2 freq. cnt.: 1 freq. cnt.: 1

anchor backbone keystone linchpin lynchpin mainstay

sample sentences

"faith is his anchor"
"the keystone of campaign reform was the ban on soft money"
"he is the linchpin of this firm"

lexical pointers

derivationally related form

anchor

semantic pointers

hypernym

support