Synonyms of 'nucleus'
a centre of growth or developmentThe movement could become the nucleus of a new political party.
A large wooden table dominates the centre of the room.
The heart of the problem is supply and demand.
The children are the focus of her life.
He has the ability to get straight to the core of a problem.
A large group of watercolours forms the pivot of the exhibition.
the kernel of his message
That, I think, is the nub of the problem.
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in the sense of core
the central or essential part of somethingHe has the ability to get straight to the core of a problem.
in the sense of focus
a point of convergence of light or sound waves, or a point from which they appear to divergeThe children are the focus of her life.
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Thesaurus for nucleus from the Collins English Thesaurus