summer duck vs wood widgeon

summer duck and wood widgeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
summer duck	Yes	No	No	No
wood widgeon	Yes	No	No	No

As nouns, summer duck and wood widgeon are synonyms defined as:

summer duck and wood widgeon: showy North American duck that nests in hollow trees

Other synonyms of summer duck include Aix sponsa, wood duck.

summer duck (noun)	wood widgeon (noun)
showy North American duck that nests in hollow trees	showy North American duck that nests in hollow trees