哗 huā / huá — crashing sound; cat-calling sound; clamor; noise; clamor; noise
听到下课铃声,教室里一下子哗然起来。Tīng dào xià kè líng shēng, jiào shì lǐ yí xià zi huá rán qǐ lái.Hearing the bell, the classroom suddenly burst into a commotion.
Common words: 喧哗 (xuān huá)、哗然 (huá rán)、哗变 (huá biàn)