When it comes to describing a large and spacious residence, "big house" may be the most common way to express it. However, there are several other synonyms that can be used to describe a grandiose residence. For example, the term mansion is used to describe an opulent and luxurious abode that is often surrounded by expansive grounds. Estate is another word used to denote a large property that may include several buildings and sprawling gardens. Meanwhile, palace is used to refer to a grand residence that is usually associated with royalty or aristocracy and is adorned with lavish decor. Other synonyms for big house include manor, villa, chateau, and castle.