swarm

Noun

• a group of many things in the air or on the ground
  • a swarm of insects obscured the light
    
  • clouds of blossoms
    
  • it discharged a cloud of spores
    

• a moving crowd

Verb

• move in large numbers
  • people were pouring out of the theater
    
  • beggars pullulated in the plaza
    

• be teeming, be abuzz
  • The garden was swarming with bees
    
  • The plaza is teeming with undercover policemen
    
  • her mind pullulated with worries
    

Related words

• Synonyms: 
  cloud , drove , horde , pour , stream , teem , pullulate