ALTOCUMULUS
ALTOSTRATUS
ANVILTOP (-s)
ARCUS (-es)
CIRROCUMULUS
CIRROSTRATUS
CIRRI
CIRRUS 
CLOUDLET (-s)
CUMULIFORM 
CUMULONIMBUS
CUMULI
CUMULUS 
CUMULOUS 
FRACTI
FRACTUS 
FUMULI
FUMULUS 
INCUDES
INCUS
MAMMATI 
MAMMATUS 
MESOSCALE 
NACREOUS 
NIMBI
NIMBOSTRATUS
NIMBUS (-ed,-es)
NUBILOUS 
PILEI
PILEUS
STRATI
STRATIFORM 
STRATOCUMULUS
STRATUS