Clouds
High level clouds (thin, ice crystals)
cirr-
cirrus cirrostratus cirrocumulus
Mid level clouds (moderately thick, sometimes silver/gray)
alto-
altocumulus altostratus
Low level clouds (thick, water droplets)
cumulus stratus nimbostratus (raining)
Vertical clouds (updrafts cause vertical development)
cumulus congestus cumulonimbus (flat top)
Wierd clouds
lenticular