swarm in WordNet English dictionary

1. 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"
   swarm  cloud 
   
2. a moving crowd
   drove  horde  swarm 
   

1. move in large numbers
   "people were pouring out of the theater"; "beggars pullulated in the plaza"
   pour  swarm  stream  teem  pullulate 
   
2. be teeming, be abuzz
   "The garden was swarming with bees"; "The plaza is teeming with undercover policemen"; "her mind pullulated with worries"
   teem  pullulate  swarm