i Register
In some senses, cornerstone is marked as figuratively. Watch for register when choosing this word.
ADJ.
all, considered, daily, equal, future, modern, public, vital
VERB + CORNERSTONE
acting, became, become, forms, like, rights, service, trust
CORNERSTONE + NOUN
algeria's, construction, creation, democracy, flatiron, freedom, government, hospitality
PREP.
on