Interaction is an important part of any successful relationship, whether it be between individuals or groups. It involves the EXCHANGE of ideas, opinions, and feelings, as well as the ability to work together to achieve a common goal. The two crossword solutions for the term interaction are EXCHANGE (8 letters) and TEAMWORK (8 letters). EXCHANGE refers to the act of exchanging information, ideas, and feelings between two or more people. TEAMWORK, on the other hand, is the ability to work together in order to achieve a common goal. Both of these concepts are essential components of successful interactions.