myna bird vs hill myna

myna bird and hill myna both are nouns.

Word	Noun	Adjective	Verb	Adverb
myna bird	Yes	No	No	No
hill myna	Yes	No	No	No

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

Other hyponyms of myna bird include Acridotheres tristis, crested myna, grackle, Gracula religiosa, Indian grackle.

myna bird (noun)	hill myna (noun)
tropical Asian starlings	glossy black Asiatic starling often taught to mimic speech