screen
榥 centers on a screen, likely a wooden framed partition or blind used to divide space or block light.
榥 combines 木 (wood) with 晃, which likely contributes the sound and possibly the idea of brightness or shining, suggesting a wooden screen that filters light.
The wood radical 木 on the left suggests a wooden frame, and 晃 on the right looks like a bright sun 日 over legs 儿, as if light is shining through a wooden screen.
For コウ, imagine a wooden screen in a cozy home: cozy -> コウ, and the screen divides the room.