cock vs cockerel

cock and cockerel both are nouns.

Word	Noun	Adjective	Verb	Adverb
cock	Yes	No	Yes	No
cockerel	Yes	No	No	No

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

cock (noun)	cockerel (noun)
adult male bird	a young domestic cock; not older than one year
adult male chicken
faucet consisting of a rotating device for regulating flow of a liquid
the part of a gunlock that strikes the percussion cap when the trigger is pulled
obscene terms for penis

cock (verb)	cockerel (verb)
set the trigger of a firearm back for firing
to walk with a lofty proud gait, often in an attempt to impress others
tilt or slant to one side