A large gathering of people of a particular type.

Roget 72: assemblage; collection, collocation, colligation^†; compilation, levy, gathering, ingathering, muster, attroupement^†; team; concourse, conflux^†, congregation, contesseration^†, convergence etc. 290; meeting, levee, reunion, drawing room, at home; conversazione [It] etc. (social gathering) 892; assembly, congress; convention, conventicle; gemote^†; conclave etc. (council) 696; posse, posse comitatus [Lat.]; Noah's ark.    miscellany, collectanea^†; museum, menagerie etc. (store) 636; museology^†.    crowd, throng, group; flood, rush, deluge; rabble, mob, press, crush, cohue^†, horde, body, tribe; crew, gang, knot, squad, band, party; swarm, shoal, school, covey, flock, herd, drove; atajo^†; bunch, drive, force, mulada [U.S.]; remuda^†; roundup [U.S.]; array, bevy, galaxy; corps, company, troop, troupe, task force; army, regiment etc. (combatants) 726; host etc. (multitude) 102; populousness.    clan, brotherhood, fraternity, sorority, association etc. (party) 712.    volley, shower, storm, cloud.    group, cluster, Pleiades, clump, pencil; set, batch, lot, pack; budget, assortment, bunch; parcel; packet, package; bundle, fascine^†, fasces^†, bale; seron^†, seroon^†; fagot, wisp, truss, tuft; shock, rick, fardel^†, stack, sheaf, haycock^†; fascicle, fascicule^†, fasciculus [Lat.], gavel, hattock^†, stook^†.    accumulation etc. (store) 636; congeries, heap, lump, pile, rouleau^†, tissue, mass, pyramid; bing^†; drift; snowball, snowdrift; acervation^†, cumulation; glomeration^†, agglomeration; conglobation^†; conglomeration, conglomerate; coacervate [Chem], coacervation [Chem], coagmentation^†, aggregation, concentration, congestion, omnium gaterum [Lat.], spicilegium^†, black hole of Calcutta; quantity etc. (greatness) 31.    collector, gatherer; whip, whipper in.    ... show more

Roget 102: multitude; numerous etc. adj.; numerosity, numerality; multiplicity; profusion etc. (plenty) 639; legion, host; great number, large number, round number, enormous number; a quantity, numbers, array, sight, army, sea, galaxy; scores, peck, bushel, shoal, swarm, draught, bevy, cloud, flock, herd, drove, flight, covey, hive, brood, litter, farrow, fry, nest; crowd etc. (assemblage) 72; lots; all in the world and his wife.    [Increase of number] greater number, majority; multiplication, multiple.    ... show more

A flock of birds (especially when gathered close together on the ground).