pin-tailed duck vs Anas acuta

pin-tailed duck and Anas acuta both are nouns.

Word	Noun	Adjective	Verb	Adverb
pin-tailed duck	Yes	No	No	No
Anas acuta	Yes	No	No	No

As nouns, pin-tailed duck and Anas acuta are synonyms defined as:

pin-tailed duck and Anas acuta: long-necked river duck of the Old and New Worlds having elongated central tail feathers

Other synonyms of pin-tailed duck include pintail.

pin-tailed duck (noun)	Anas acuta (noun)
long-necked river duck of the Old and New Worlds having elongated central tail feathers	long-necked river duck of the Old and New Worlds having elongated central tail feathers