The Oxford Thesaurus An A-Z Dictionary of Synonyms - swarm n.

1) throng, horde, army, host, multitude, hive, herd, mob, mass, drove, flood, stream, cloud, flock, pack, shoal, bunch: Swarms of people showed up for our garden party. --v. 2) throng, mass, crowd, congregate, flock, gather, flood, stream, flow: The fans swarmed round the rock group. 3) swarm with. Often, be swarming with. crawl with, abound in or with, throng with, teem with, burst with, bristle with, be overrun with: In two minutes the place was swarming with police.