flock vs gaggle

flock and gaggle both are nouns.

Word	Noun	Adjective	Verb	Adverb
flock	Yes	No	Yes	No
gaggle	Yes	No	Yes	No

As nouns, gaggle is a hyponym of flock; that is, gaggle is a word with a more specific, narrower meaning than flock:

Other hyponyms of flock include bevy, covert, covey, exaltation, wisp, flight.

flock (noun)	gaggle (noun)
a group of birds	a flock of geese
a group of sheep or goats
a church congregation guided by a pastor
an orderly crowd
(often followed by `of') a large number or amount or extent

flock (verb)	gaggle (verb)
come together as in a cluster or flock	make a noise characteristic of a goose
move as a crowd or in a group