song thrush vs Turdus philomelos

song thrush and Turdus philomelos both are nouns.

Word	Noun	Adjective	Verb	Adverb
song thrush	Yes	No	No	No
Turdus philomelos	Yes	No	No	No

As nouns, song thrush and Turdus philomelos are synonyms defined as:

song thrush and Turdus philomelos: common Old World thrush noted for its song

Other synonyms of song thrush include mavis, throstle.

song thrush (noun)	Turdus philomelos (noun)
common Old World thrush noted for its song	common Old World thrush noted for its song