essence, crux, core, nitty-gritty*; see essence 1.
"nub." YourDictionary, n.d. Web. 11 October 2018. <http://thesaurus.yourdictionary.com/nub>.
nub. (n.d.). Retrieved October 11th, 2018, from http://thesaurus.yourdictionary.com/nub
An unevenness or elevation on a surface:
The most central and material part:
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