“flock” is a noun and verb with 7 meanings. Its most common meaning is: a church congregation guided by a pastor.
flock
noun
a church congregation guided by a pastor
a group of birds
(often followed by `of') a large number or amount or extent
“a batch of letters”
“a deal of trouble”
an orderly crowd
“a troop of children”
a group of sheep or goats
verb
move as a crowd or in a group
“Tourists flocked to the shrine where the statue was said to have shed tears”
come together as in a cluster or flock
“The poets constellate in this town every summer”
Source: WordNet 3.1, Princeton University