thrush vs singer

thrush and singer both are nouns.

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

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

Other hypernyms of thrush include vocaliser, vocalist, vocalizer.

thrush (noun)	singer (noun)
songbirds characteristically having brownish upper plumage with a spotted breast	a person who sings
a woman who sings popular songs
candidiasis of the oral cavity; seen mostly in infants or debilitated adults