The term 'not imaginary' can be broken down into four crossword solutions: CONCRETE (8 letters), REAL (4 letters), EXISTENT (8 letters), and reallife (8 letters). CONCRETE refers to something that is solid and tangible, while REAL implies that something is genuine and not a fabrication. EXISTENT means that something actually exists, and reallife suggests that something is not a figment of one's imagination but rather a part of everyday life. Together, these four words describe something that is not imaginary but instead is tangible, genuine, existing, and part of everyday life.