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Deliberately and maliciously set something (buildings usually) on fire

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The Chairman of our company takes care of the rank and file in the company

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 A small organised dissenting group within a larger one

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The rich man was known all throughout the country for his noble deeds, kindness and as one who makes an active effort to promote human welfare.

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 The study of population and its dynamics

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A person who eats the flesh of other human beings.

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The organic component of soil, formed by the decomposition of leaves and other plant material

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 Having or showing an excessively high opinion of one's appearance, abilities, or worth