| Word | Definitions | Synonyms |
|---|---|---|
| cumulation | (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulus, heap, mound, pile |
| cumulonimbus | (noun) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms | Synonyms: cumulonimbus cloud, thundercloud |
| cumulus | (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulation, heap, mound, pile |
| (noun) a globular cloud | Synonyms: cumulus cloud |