A solar chimney is a system that uses the sun's energy to create natural ventilation in a building. There are a few different words that can be used as synonyms for a solar chimney. The first is "solar tower," which describes a similar structure that directs air upwards using the sun's heat. Another synonym is "thermal chimney," which refers to a design that allows hot air to rise and escape through a vent, drawing cooler air in behind it. Finally, the term "stack ventilation" can also be used to describe a solar chimney, as it uses the same principle of drawing air through a space by creating a temperature difference.