common evening primrose vs Oenothera biennis

common evening primrose and Oenothera biennis both are nouns.

Word	Noun	Adjective	Verb	Adverb
common evening primrose	Yes	No	No	No
Oenothera biennis	Yes	No	No	No

As nouns, common evening primrose and Oenothera biennis are synonyms defined as:

common evening primrose and Oenothera biennis: a coarse biennial of eastern North America with yellow flowers that open in the evening; naturalized in Europe

Other synonyms of common evening primrose include German rampion.

common evening primrose (noun)	Oenothera biennis (noun)
a coarse biennial of eastern North America with yellow flowers that open in the evening; naturalized in Europe	a coarse biennial of eastern North America with yellow flowers that open in the evening; naturalized in Europe