Rural expanse is a term used to describe a large area of land that is mostly rural or agricultural in nature. PASTURE, with seven letters, is an area of land used for grazing animals such as cows, horses, and sheep. LEA, with three letters, is an old English word for a grassy meadow or open field. Together, these two words can be used to describe a rural expanse, which is a large area of land that is mostly rural or agricultural in nature.