Turdus greyi vs thrush

Turdus greyi and thrush both are nouns.

Word	Noun	Adjective	Verb	Adverb
Turdus greyi	Yes	No	No	No
thrush	Yes	No	No	No

As nouns, thrush is a hypernym of Turdus greyi; that is, thrush is a word with a broader meaning than Turdus greyi:

Turdus greyi: robin of Mexico and Central America
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

Turdus greyi (noun)	thrush (noun)
robin of Mexico and Central America	songbirds characteristically having brownish upper plumage with a spotted breast
	a woman who sings popular songs
	candidiasis of the oral cavity; seen mostly in infants or debilitated adults