flock vs covert

flock and covert both are nouns.

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

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

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

flock (noun)	covert (noun)
a group of birds	a covering that serves to conceal or shelter something
a group of sheep or goats	a flock of coots
a church congregation guided by a pastor
an orderly crowd
(often followed by `of') a large number or amount or extent

flock (adjective)	covert (adjective)
	secret or hidden; not openly practiced or engaged in or shown or avowed
	(of a wife) being under the protection of her husband

flock (verb)	covert (verb)
come together as in a cluster or flock
move as a crowd or in a group