red jungle fowl vs gallina

red jungle fowl and gallina both are nouns.

Word	Noun	Adjective	Verb	Adverb
red jungle fowl	Yes	No	No	No
gallina	Yes	No	No	No

As nouns, gallina is a hypernym of red jungle fowl; that is, gallina is a word with a broader meaning than red jungle fowl:

red jungle fowl: a jungle fowl of southeastern Asia that is considered ancestral to the domestic fowl
gallina: small Asiatic wild bird; believed to be ancestral to domestic fowl

Other hypernyms of red jungle fowl include jungle fowl.

red jungle fowl (noun)	gallina (noun)
a jungle fowl of southeastern Asia that is considered ancestral to the domestic fowl	small Asiatic wild bird; believed to be ancestral to domestic fowl