summer duck vs Aix sponsa

summer duck and Aix sponsa both are nouns.

Word	Noun	Adjective	Verb	Adverb
summer duck	Yes	No	No	No
Aix sponsa	Yes	No	No	No

As nouns, summer duck and Aix sponsa are synonyms defined as:

summer duck and Aix sponsa: showy North American duck that nests in hollow trees

Other synonyms of summer duck include wood duck, wood widgeon.

summer duck (noun)	Aix sponsa (noun)
showy North American duck that nests in hollow trees	showy North American duck that nests in hollow trees