cloud

noun

1.
any collection of particles (e.g., smoke or dust) or gases that is visible
2.
a visible mass of water or ice particles suspended at a considerable altitude
Derived from:
cloud cloudy
3.
out of touch with reality
4.
a cause of worry or gloom or trouble
5.
suspicion affecting your reputation
Derived from:
cloud
6.
a group of many things in the air or on the ground
swarm