Englishfor English speakers
nucleus
Noun
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A nucleus is the center of a cell or atom.
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The center of anything.
growth
Noun
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The act of growing (getting bigger); an increase in size, number, value, or strength.
I'm pleased with the growth in value of our house in the years after we bought it.
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Something that grows or has grown; a mass that is not normal, such as a tumor.
There was a healthy growth of bushes near the house.
He died of a growth in his brain.