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Noun cloud  has 6 senses
cloud - any collection of particles (e.g., smoke or dust) or gases that is visible--1 is a kind of physical phenomenon
 --1 has particulars:
cloud - a visible mass of water or ice particles suspended at a considerable altitude--2 is a kind of atmospheric phenomenon
 --2 is a part of sky
 --2 has substances: water vapor, water vapour
 --2 has particulars:
 |  | cirrocumulus, cirrocumulus cloud; cirrostratus, cirrostratus cloud; cirrus, cirrus cloud; cloud bank; contrail, condensation trail; cumulonimbus, cumulonimbus cloud, thundercloud; cumulus, cumulus cloud; nacreous cloud, mother-of-pearl cloud; nimbus, nimbus cloud, rain cloud; storm cloud; stratus, stratus cloud | 
cloud - out of touch with reality; "his head was in the clouds"--3 is a kind of unreality, irreality
 
cloud - a cause of worry or gloom or trouble; "the only cloud on the horizon was the possibility of dissent by the French"--4 is a kind of gloom, gloominess, glumness
 
cloud - suspicion affecting your reputation; "after that mistake he was under a cloud"--5 is a kind of suspicion
 
swarm, cloud - a group of many insects; "a swarm of insects obscured the light"; "a cloud of butterflies"--6 is a kind of animal group
 --6 has members: insect
 --6 has particulars: infestation, plague
 
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