"Domal" is a less common word and typically refers to something that resembles a dome or has a domed shape. Some synonyms for this word include "vaulted", "arched", "hemispherical", "curved", "rounded", or "bowed". These words describe the physical shape of something that is similar to a dome, such as a ceiling in a religious building or an architectural feature on a building or structure. Synonyms can help to broaden our vocabulary and allow for more precise communication when describing shapes and structures.