throstle vs thrush

throstle and thrush both are nouns.

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

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

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

throstle (noun)	thrush (noun)
common Old World thrush noted for its song	songbirds characteristically having brownish upper plumage with a spotted breast
a spinning machine formerly used to twist and wind fibers of cotton or wool continuously	a woman who sings popular songs
	candidiasis of the oral cavity; seen mostly in infants or debilitated adults