1swarm 
/ˈswoɚm/ noun
plural swarms /ˈswoɚm/ noun [count] : a very large number of insects moving together
▪ a swarm of bees/mosquitoes/ants/locusts — often used figuratively ▪ The tourists arrived in swarms.
▪ a swarm of bees/mosquitoes/ants/locusts — often used figuratively ▪ The tourists arrived in swarms.
