bunch

charmed circle, elite, in-group

club, college, fellowship, guild (also gild), league, organization, society

camp, faction, sect, side, tribe

mess, squad

brotherhood, fraternity, order, sisterhood, sodality, sorority

commune

alliance, bloc, coalition, confederation, congress, council, federation, union

accumulation, aggregate, aggregation, conglomeration

agglomeration, assortment, hodgepodge, jumble, miscellany, mixture, odds and ends, sundries, variety

cycle, run, series, suit

assembly, collective, congregation, gathering, muster, organization

circle, clan, clique, coterie, fellowship, gang, ring, round, set

faction, guild (also gild), order, school, sect

brigade, crew, outfit, phalanx, platoon, posse, task force, team

alliance, bloc, coalition, confederacy, confederation, federation, league, union

battalion, squadron

bevy, brood, covey

dome

blob, bump, dilatation, hump, knob, knot, knurl, lump, nub, obtrusion, puff, snag, swelling

block, piece, portion, section

enlargement, escalation, expansion, increase

hill, mound

epidemic, plague, rash

bonanza, embarrassment, excess, overabundance, overage, overkill, overmuch, oversupply, plethora, redundancy, superabundance, superfluity, surfeit, surplus

deluge, flood, overflow

army, bevy, cram, crowd, crush, drove, flock, herd, horde, host, legion, mob, multitude, press, score, sea, swarm, throng

dome

blow up, inflate

dilate, distend, expand

mushroom, snowball

elongate, extend, lengthen, stretch

assemble, collect, concentrate, congregate, convene, converge, flock, forgather (or foregather), herd, swarm, throng

encircle, mob, surround

embrace, hug