robin vs thrush

robin and thrush both are nouns.

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

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

robin: large American thrush having a rust-red breast and abdomen
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

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

robin: small Old World songbird with a reddish breast
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

robin (noun)	thrush (noun)
large American thrush having a rust-red breast and abdomen	songbirds characteristically having brownish upper plumage with a spotted breast
small Old World songbird with a reddish breast	a woman who sings popular songs
	candidiasis of the oral cavity; seen mostly in infants or debilitated adults