fighting cock vs gamecock

fighting cock and gamecock both are nouns.

Word	Noun	Adjective	Verb	Adverb
fighting cock	Yes	No	No	No
gamecock	Yes	No	No	No

As nouns, fighting cock and gamecock are synonyms defined as:

fighting cock (noun)	gamecock (noun)
a cock bred and trained for fighting	a cock bred and trained for fighting
	someone who is a very fierce fighter