The term SOUTHWESTERN HOME is composed of two crossword solutions: CASA and ADOBE. CASA is a Spanish word meaning 'HOUSE' or 'HOME, ' while ADOBE is a type of building material used in the Southwestern United States. ADOBE is made from mud, straw, and water, and is used to construct walls and other structures. Together, these two words represent a HOME in the Southwestern United States, which is typically constructed with ADOBE materials.