The term 'make harmonious' can be expressed in three different ways: ATTUNE (6 letters), SYNC (4 letters), and COORDINATE (10 letters). ATTUNE means to adjust or tune something to a particular frequency or pitch, while sync means to bring into harmony or agreement. COORDINATE, on the other hand, means to bring different elements into a harmonious or orderly relationship. All three terms refer to the idea of creating harmony or agreement between two or more elements.