musk duck vs Cairina moschata

musk duck and Cairina moschata both are nouns.

Word	Noun	Adjective	Verb	Adverb
musk duck	Yes	No	No	No
Cairina moschata	Yes	No	No	No

As nouns, musk duck and Cairina moschata are synonyms defined as:

musk duck and Cairina moschata: large crested wild duck of Central America and South America; widely domesticated

Other synonyms of musk duck include muscovy duck.

musk duck (noun)	Cairina moschata (noun)
large crested wild duck of Central America and South America; widely domesticated	large crested wild duck of Central America and South America; widely domesticated