Turdus migratorius vs American robin

Turdus migratorius and American robin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Turdus migratorius	Yes	No	No	No
American robin	Yes	No	No	No

As nouns, Turdus migratorius and American robin are synonyms defined as:

Turdus migratorius and American robin: large American thrush having a rust-red breast and abdomen

Other synonyms of Turdus migratorius include robin.

Turdus migratorius (noun)	American robin (noun)
large American thrush having a rust-red breast and abdomen	large American thrush having a rust-red breast and abdomen