mavis vs thrush

mavis and thrush both are nouns.

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

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

mavis: common Old World thrush noted for its song
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

mavis (noun)	thrush (noun)
common Old World thrush noted for its song	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