What is another word for linchpin?

Need synonyms for linchpin? Here's a list of similar words from our thesaurus that you can use instead.

A pin inserted through holes at the end of an axle, so as to secure a wheel
“The diversity and broad appeal that had been the linchpin of its success now drained away like vital oil.”
The central aspect of something an argument or consideration
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A person or thing on which something else is based or depends
A central or foremost person or figure within a given domain
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