They are both a part of the supercontinent of America
They are both a part of Latin America (both partially)
They are both fully in the Western Hemisphere
They are both in the northern hemisphere (fully or partially)
They are the third and fourth largest continents by area
They are the fourth and fifth largest continents by population
They both border the Atlantic, Pacific, and Caribbean
They are both a part of the New World
They were both imperialized by European nations (most notably Spain, Great Britain, and France)
America
The common noun for America is country. For North America or South America, the common noun is continent.
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South of North America is South America.
South America
North America
The continent south of North America is South America.
North America
North America.
North America and South America
North America is south of the north pole.
North America is south of the north pole.