red jungle fowl vs Gallus gallus

red jungle fowl and Gallus gallus both are nouns.

Word	Noun	Adjective	Verb	Adverb
red jungle fowl	Yes	No	No	No
Gallus gallus	Yes	No	No	No

As nouns, red jungle fowl and Gallus gallus are synonyms defined as:

red jungle fowl and Gallus gallus: a jungle fowl of southeastern Asia that is considered ancestral to the domestic fowl

red jungle fowl (noun)	Gallus gallus (noun)
a jungle fowl of southeastern Asia that is considered ancestral to the domestic fowl	a jungle fowl of southeastern Asia that is considered ancestral to the domestic fowl
	a domestic fowl bred for flesh or eggs; believed to have been developed from the red jungle fowl