The word 'riage' may seem unfamiliar at first glance, but it actually has several synonyms that are commonly used in everyday language. One such synonym is 'union', which refers to the act of two or more parties coming together to form a cohesive whole. Another synonym for 'riage' is 'marriage', which specifically refers to the legal and social union of two people. Other synonyms for 'riage' might include 'partnership', 'alliance', 'matrimony', and 'wedlock'. Whatever word is used, the concept of 'riage' is an important one, as it denotes a level of commitment and cooperation that is essential for any successful relationship.