Clouds. I wandered lonely as a cloud, That floats on high o'er vales and hills…. Thin wispy high clouds. Cirrus. High, small, puffy and patchy. Cirrocumulus. Tall, fluffy angry looking grey clouds. Cumulonimbus. Medium height, small puffy clouds, patchy lines. Altocumulus.
I wandered lonely as a cloud, That floats on high o'er vales and hills….
Cirro- given to high altitude clouds- means wisp of hair.
Alto- given to mid-altitude clouds- means high.
Nimbo (prefix) or nimbus (suffix)- is used for clouds that bring rain.
Cumulo- means heap and refer to piles of clouds.
Stratus- means layer and refers to flat wide layered clouds.
All images are Creative Commons- with except of the cloud diagram- source unknown.