The term 'cloud, type of' can be broken down into five different cloud types: cirrostratus (12 letters), STRATUS (7 letters), CIRRUS (6 letters), CUMULUS (7 letters) and NIMBUS (6 letters). Cirrostratus clouds are thin, white, sheet-like clouds that often cover the entire sky. STRATUS clouds are low-level clouds that form a grey, uniform layer. CIRRUS clouds are thin, wispy clouds that are made up of ice crystals. CUMULUS clouds are large, fluffy clouds that look like cotton balls. NIMBUS clouds are dark, rain-bearing clouds.