The word "森林" is formed by combining the characters "森" and "林", both derived from the radical "木" meaning tree. "林" consists of two "木" characters, representing a grove or cluster of trees, while "森" consists of three "木" characters, implying a denser or more extensive woodland. Together, they create a compound term where the duplication and triplication of the tree radical visually and semantically emphasize the concept of a forest.