(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”
(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”