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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

process, physical process go
a sustained phenomenon or one marked by gradual changes through a series of states

phenomenon go
any state or process known through the senses rather than by intuition or reasoning

natural phenomenon go
all phenomena that are not artificial

physical phenomenon go
a natural phenomenon involving the physical properties of matter and energy

atmospheric phenomenon go
a physical phenomenon associated with the atmosphere

cloud
a visible mass of water or ice particles suspended at a considerable altitude

noun.object

12 Subcategories

cirrocumulus, cirrocumulus cloud go
a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples
cirrostratus, cirrostratus cloud go
a thin uniform layer of hazy cloud at high altitude
cirrus, cirrus cloud go
a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
cloud bank go
a layer of clouds seen from a distance
contrail, condensation trail go
an artificial cloud created by an aircraft
cumulonimbus, cumulonimbus cloud, thundercloud go
a dark cloud of great vertical extent charged with electricity
cumulus, cumulus cloud go
a globular cloud
nacreous cloud, mother-of-pearl cloud go
a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
nebule go
a small cloud
nimbus, nimbus cloud, rain cloud go
a dark grey cloud bearing rain
storm cloud go
a heavy dark cloud presaging rain or a storm
stratus, stratus cloud go
a large dark low cloud