AP Human Review :)

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a region with one or more urban clusters of at least 10,000 people at its core

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micropolitan statistical area

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region with at least one urbanized area as its core

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metropolitan statistical area

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an urban area in the US with fewer than 50,000 inhabitants

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urban cluster

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a very large and densely populated city, particularly the capital or major city in a country/region

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metropolis

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any self-governing place in the US that contains at least 2,500 people

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urban area

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The largest city in the world is

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Tokyo

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city cluster or supercity comprised of two or more metropolitan areas that merge together into a continuous urban region

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megalopolis

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a single, uninterrupted urban area

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conurbation

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A city with a population of over twenty million people

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metacity

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A city with a population of over ten million

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megacity