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Renowned/Well-known/Famous scientist Albert Brown will speak at the university tonight.

Are there any marginal differences in meanings among the underlined words? Thanks.
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Renowned and famous mean much the same thing. I think renowned tends to be used to describe people in the literary arts/sciences - a renowned author or scientist, whilst famous is more used for people in entertainment - famous actor or pop star. Well known can apply to either, and just means without particular achievements to get them the status of renowned or famous.
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Thanks, Tidus, for the clear reply.