Turdus pilaris vs thrush

Turdus pilaris and thrush both are nouns.

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

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

Turdus pilaris: medium-sized Eurasian thrush seen chiefly in winter
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

Turdus pilaris (noun)	thrush (noun)
medium-sized Eurasian thrush seen chiefly in winter	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