The word "纷繁" is formed by combining the characters "纷" and "繁", each contributing semantically to convey notions of multiplicity and complexity. "纷" incorporates the silk radical (纟) alongside the phonetic component "分", suggesting tangled or numerous threads, while "繁" includes the silk radical (糸) with "敏" as a phonetic element, denoting intricacy or abundance. Together, they create a compound word where both characters reinforce the idea of profuse and complicated details.