bird vs cock

bird and cock both are nouns.

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

bird: warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
cock: adult male bird

Other hyponyms of bird include dickey-bird, dickeybird, dicky-bird, dickybird, hen, nester, night bird, bird of passage, protoavis, Archaeopteryx lithographica, archaeopteryx, archeopteryx, Sinornis, Ibero-mesornis, archaeornis, ratite, ratite bird, flightless bird, carinate, carinate bird, flying bird, passeriform bird, passerine, nonpasserine bird, raptor, raptorial bird, bird of prey, gallinacean, gallinaceous bird, parrot, cuculiform bird, coraciiform bird, apodiform bird, caprimulgiform bird, piciform bird, trogon, aquatic bird, twitterer.

bird (noun)	cock (noun)
warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings	obscene terms for penis
the flesh of a bird or fowl (wild or domestic) used as food	faucet consisting of a rotating device for regulating flow of a liquid
informal terms for a (young) woman	the part of a gunlock that strikes the percussion cap when the trigger is pulled
a cry or noise made to express displeasure or contempt	adult male chicken
badminton equipment consisting of a ball of cork or rubber with a crown of feathers	adult male bird

bird (verb)	cock (verb)
watch and study birds in their natural habitat	tilt or slant to one side
	set the trigger of a firearm back for firing
	to walk with a lofty proud gait, often in an attempt to impress others