snowbird vs thrush

snowbird and thrush both are nouns.

Word	Noun	Adjective	Verb	Adverb
snowbird	Yes	No	No	No
thrush	Yes	No	No	No

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

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

snowbird (noun)	thrush (noun)
white Arctic bunting	songbirds characteristically having brownish upper plumage with a spotted breast
small North American finch seen chiefly in winter	a woman who sings popular songs
medium-sized Eurasian thrush seen chiefly in winter	candidiasis of the oral cavity; seen mostly in infants or debilitated adults