The term 'Broad Area' can be defined as an EXPANSE, which is a seven-letter word. An EXPANSE is a large area of land or sea, typically one that is unbroken by features such as mountains or rivers. It is often used to describe a vast area of land or sea that is relatively flat and featureless. The term is also used to describe a wide range of topics, such as a broad area of knowledge or a broad area of research.