cloud
雲 centers on visible masses of water droplets or ice crystals in the sky: a cloud.
雲 combines 雨 (rain) with 云, which originally depicted swirling vapor and also provides the sound. Together they express a rain-bearing cloud.
Rain 雨 gathers above swirling vapor 云, forming a cloud.
For ウン, imagine a cloud so thick it makes the sky look like a woolly un (a playful sound for 'oon'): un -> ウン, and the cloud darkens the sky.
cloud
Izumo (former province located in the east of present-day Shimane Prefecture)
mica; isinglass
nebula
thick clouds
daybreak; dawn; aurora
rain cloud
winds and clouds; nature; the elements
sea of clouds
gathering clouds; group of clouds
wonton (Chinese dumpling); won ton; wantan; wanton; wuntun
iridescent clouds; glowing clouds
skylark (Alauda arvensis)
weather; look of the sky
cumulonimbus cloud
dark clouds
auspicious clouds
reckless; (at) random; haphazard; blind; sudden; abrupt
wide difference; a world of difference
mozuku (Cladosiphon okamuranus and Sphaerotrichia divaricata, types of edible seaweed)