Open English Wordnet
Nouns
(n)swarm, clouda 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” Verbs
(v)teem, pullulate, swarmbe teeming, be abuzz“The garden was swarming with bees”,
“The plaza is teeming with undercover policemen”,
“her mind pullulated with worries”