The term 'BIG CHAIN' can be solved by the crossword solution WALMART, which is a 7 letter word. Walmart is an American multinational retail corporation that operates a chain of hypermarkets, discount department stores, and grocery stores. It is the world's largest company by revenue, with over 11, 000 stores in 28 countries. Walmart is known for its low prices and wide selection of products, making it one of the most popular retailers in the world.