spreading dogbane vs common dogbane

spreading dogbane and common dogbane both are nouns.

Word	Noun	Adjective	Verb	Adverb
spreading dogbane	Yes	No	No	No
common dogbane	Yes	No	No	No

As nouns, spreading dogbane and common dogbane are synonyms defined as:

spreading dogbane and common dogbane: North American perennial having pinkish flowers in loose cymes; used in folk medicine for pain or inflammation in joints

Other synonyms of spreading dogbane include Apocynum androsaemifolium, rheumatism weed.

spreading dogbane (noun)	common dogbane (noun)
North American perennial having pinkish flowers in loose cymes; used in folk medicine for pain or inflammation in joints	North American perennial having pinkish flowers in loose cymes; used in folk medicine for pain or inflammation in joints