gist, kernel, heart; see essence 1.
hub, nucleus, focus; see center 1.
"core." YourDictionary, n.d. Web. 12 November 2018. <https://thesaurus.yourdictionary.com/Core>.
core. (n.d.). Retrieved November 12th, 2018, from https://thesaurus.yourdictionary.com/Core
A point of origin from which ideas or influences, for example, originate:
The most central and material part:
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