cornerstone Synonyms

groundwork foundation base basis fundament rudiment significance spanner stiffener stone substratum root nucleus pillar pivot principle prop pyridine quoin radix rock substructure support foundation stone rocks thymine foundations central component key element main ingredient fundamental point Central Point mecca underpinning vaulting bedrock fundamental principle point of departure knowledgeableness ft Rock of Gibraltar principal constituent milestone flotation essential essence cynosure crux cornering core