A trade association is an organization of businesses that operate in a specific industry. The three crossword solutions for the term 'trade association' are GUILD (5 letters), barter ers (9 letters), and GILD (4 letters). A GUILD is an association of people with similar interests or occupations that often provides mutual aid and protection. Barter ers are people who exchange goods or services without using money. Gilding is the process of applying a thin layer of gold to an object to give it a decorative finish.