mynah bird vs grackle

mynah bird and grackle both are nouns.

Word	Noun	Adjective	Verb	Adverb
mynah bird	Yes	No	No	No
grackle	Yes	No	No	No

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

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

mynah bird (noun)	grackle (noun)
tropical Asian starlings	long-tailed American blackbird having iridescent black plumage
	glossy black Asiatic starling often taught to mimic speech