noisy
嘈 centers on a loud, confused sound: a noisy clamor or uproar, often from many voices or sources at once.
嘈 combines 口 (mouth) with 曹, which likely contributes the sound and suggests a group or gathering, giving the idea of many mouths making noise together.
A mouth 口 beside 曹, which looks like a crowd of people talking all at once. Imagine a noisy gathering where everyone's mouth is going at the same time.
For ソウ, picture a noisy crowd making a loud 'sow' sound, like the noise of a chaotic marketplace: sow -> ソウ.
heartburn; sour stomach