essence, crux, core, nitty-gritty*; see essence 1.
"nub." YourDictionary, n.d. Web. 08 December 2018. <https://thesaurus.yourdictionary.com/nub>.
nub. (n.d.). Retrieved December 08th, 2018, from https://thesaurus.yourdictionary.com/nub
An unevenness or elevation on a surface:
The most central and material part:
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