Voluminosity is a rare and uncommon word that refers to the state of being large or bulky, especially in relation to size or quantity. Synonyms for the word voluminosity include spaciousness, roominess, sizeable, extensive, colossal, enormous, and sizable. These words are used to describe anything that is physically large or takes up a lot of space. They can be used to describe a variety of things such as buildings, furniture, vehicles, animals, or even concepts or ideas. While voluminosity may not be a commonly used word, these synonyms provide a range of options to convey the same meaning.