Synonyms of keystone in English:

keystone


See definition of keystone

noun

1‘a carved head formed the keystone of the door’

SYNONYMS
cornerstone, central stone, quoin

2‘cooperation remains the keystone of the government's security policy’

SYNONYMS
foundation, basis, linchpin, cornerstone, base, principle, guiding principle, core, heart, centre, crux, fundament, mainspring, priority