What context can I use each word in?
Learn when and how to use these words with these examples!
cornerstone
Example
Honesty is the cornerstone of any healthy relationship. [cornerstone: noun]
Example
The signing of the Declaration of Independence was a cornerstone moment in American history. [cornerstone: adjective]
keystone
Example
Communication is the keystone of a successful team. [keystone: noun]
Example
The keystone species in this ecosystem is the beaver. [keystone: adjective]
Good things to know
Which word is more common?
Cornerstone is more commonly used than keystone in everyday language, particularly in the context of describing a fundamental or essential element of something.
What’s the difference in the tone of formality between cornerstone and keystone?
Both cornerstone and keystone are relatively formal words, but cornerstone may be slightly more formal due to its historical roots in architecture and masonry.
