grackle vs New World blackbird

grackle and New World blackbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
grackle	Yes	No	No	No
New World blackbird	Yes	No	No	No

As nouns, New World blackbird is a hypernym of grackle; that is, New World blackbird is a word with a broader meaning than grackle:

grackle: long-tailed American blackbird having iridescent black plumage
New World blackbird: any bird of the family Icteridae whose male is black or predominantly black

Other hypernyms of grackle include blackbird.

grackle (noun)	New World blackbird (noun)
long-tailed American blackbird having iridescent black plumage	any bird of the family Icteridae whose male is black or predominantly black
glossy black Asiatic starling often taught to mimic speech