The noun 'swarm' is a singular, common, concrete noun.
The noun 'swarm is also a standard collective noun for:
- a swarm of ants
- a swarm of bees
- a swarm of butterflies
- a swarm of cockroaches
- a swarm of coots
- a swarm of dragon fish
- a swarm of drones
- a swarm of earthquakes
- a swarm of eels
- a swarm of flies
- a swarm of gnats
- a swarm of grasshoppers
- a swarm of hornets
- a swarm of insects
- a swarm of locusts
- a swarm of mosquitoes
- a swarm of rats
- a swarm of suitors
- a swarm of sycophants
- a swarm of termites