A penthouse is defined as a luxurious apartment located on the top floor or rooftop of a building. While penthouse is a commonly used term to describe such accommodations, there are other synonymic words used. Sky apartments, rooftop suites, high-rise residences, sky mansions, and upper deck flats are just a few alternatives to the word penthouse. These words offer a unique way of describing the elegance and prestige associated with such high-end living spaces. Whether it is an urban apartment or a countryside mansion, the synonyms for penthouse provide more descriptive and imaginative ways of showcasing luxury properties.