summer duck vs wood duck

summer duck and wood duck both are nouns.

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

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

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

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

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