Turdus merula vs thrush

Turdus merula and thrush both are nouns.

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

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

Turdus merula: common black European thrush
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

Turdus merula (noun)	thrush (noun)
common black European thrush	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