The word **眩晕 (xuànyūn)** is a **coordinated compound** formed by combining two semantically similar characters: **眩 (xuàn)**, which primarily denotes visual dizziness or blurred vision, and **晕 (yūn)**, which refers to a feeling of dizziness or lightheadedness in the head or senses. Together, they create a more comprehensive and emphatic term meaning "vertigo" or "dizziness," encompassing both the visual and physical sensations of disorientation. This formation follows a common pattern in Chinese where near-synonyms are paired to reinforce a unified concept, resulting in a word that functions as a verb or adjective.