cūˈmulocirrˈus noun (pl cūˈmulocirrˈi /-ī/)

A delicate cirrus-like cumulus cloud

cūˈmulonimˈbus noun (pl cūˈmulonimˈbi) /-bī/

A cumulus cloud of great height, often discharging showers or characteristic of thunderstorms

cūˈmulostraˈtus /-strāˈ or sträˈ/ noun (pl cūˈmulostraˈta /-tə/)

A cumulus cloud with an extended base