a number of animals of one kind, esp. sheep, goats, or birds, that keep or feed together or are herded together.

a large number of people; crowd.

a large group of things

a flock of letters to answer.

(in New Testament and ecclesiastical use)

the Christian church in relation to Christ.

a single congregation in relation to its pastor.

Archaic . a band or company of persons.

to gather or go in a flock or crowd

They flocked around the football hero.

verb

disperse , separate , spread

noun

army , assembly , bevy , brood , cloud , collection , colony , company , convoy , crowd , crush , drift , drove , flight , gaggle , gathering , group , herd , host , legion , litter , mass , multitude , pack , progeny , rout , scores , skein , throng , horde , mob , press , ruck , swarm , score , covey , lot

verb

collect , converge , crowd , gather , group , herd , huddle , mass , throng , troop , mob , press , aggregation , assembly , bevy , brood , bunch , church , collection , company , congregation , drift , drove , flight , gaggle , gang , gathering , legion , multitude , pack , rush , swarm