grackle vs blackbird

grackle and blackbird both are nouns.

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

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

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

Other hypernyms of grackle include New World blackbird.

grackle (noun)	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	common black European thrush