flock vs bird

flock and bird both are nouns.

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

flock (noun)	bird (noun)
a group of birds	warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
a group of sheep or goats	badminton equipment consisting of a ball of cork or rubber with a crown of feathers
a church congregation guided by a pastor	a cry or noise made to express displeasure or contempt
an orderly crowd	the flesh of a bird or fowl (wild or domestic) used as food
(often followed by `of') a large number or amount or extent	informal terms for a (young) woman

flock (verb)	bird (verb)
come together as in a cluster or flock	watch and study birds in their natural habitat
move as a crowd or in a group