throstle vs song thrush

throstle and song thrush both are nouns.

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

As nouns, throstle and song thrush are synonyms defined as:

Other synonyms of throstle include mavis, Turdus philomelos.

throstle (noun)	song thrush (noun)
common Old World thrush noted for its song	common Old World thrush noted for its song
a spinning machine formerly used to twist and wind fibers of cotton or wool continuously