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NUCLEUS

Definition:

[noun] a part of the cell containing DNA and RNA and responsible for growth and reproduction
Synonyms: cell karyon
[noun] the positively charged dense center of an atom
[noun] a small group of indispensable persons or things; "five periodicals make up the core of their publishing program"
Synonyms: core, core group
[noun] (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
[noun] any histologically identifiable mass of neural cell bodies in the brain or spinal cord