S: (n) swarm, cloud (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"
Verb
S: (v) teem, pullulate, swarm (be teeming, be abuzz) "The garden was swarming with bees"; "The plaza is teeming with undercover policemen"; "her mind pullulated with worries"
S: (v) pour, swarm, stream, teem, pullulate (move in large numbers) "people were pouring out of the theater"; "beggars pullulated in the plaza"