Select the option that can be used as a one-word substitute for the given group of words. One who feeds on human flesh

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An instrument for detecting an earthquake

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A child born after the death of his father

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 'Converting waste into reusable material.'

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Something that is to your advantage but happened by chance

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Walk or move at a slow, relaxed pace

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A slowly moving mass or river of ice

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 Unable to speak distinctly or express oneself clearly