Parthenium hysterophorus vs bastard feverfew

Parthenium hysterophorus and bastard feverfew both are nouns.

Word	Noun	Adjective	Verb	Adverb
Parthenium hysterophorus	Yes	No	No	No
bastard feverfew	Yes	No	No	No

As nouns, Parthenium hysterophorus and bastard feverfew are synonyms defined as:

Parthenium hysterophorus and bastard feverfew: tropical American annual weed with small radiate heads of white flowers; adventive in southern United States

Parthenium hysterophorus (noun)	bastard feverfew (noun)
tropical American annual weed with small radiate heads of white flowers; adventive in southern United States	tropical American annual weed with small radiate heads of white flowers; adventive in southern United States