"swarm" in the noun sense
1. drove, horde, swarm
a moving crowd
2. 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"
"swarm" in the verb sense
1. 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"
2. pour, swarm, stream, teem, pullulate
move in large numbers
"people were pouring out of the theater"
"beggars pullulated in the plaza"
Source: WordNet® (An amazing lexical database of English)
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