Apocynum pumilum vs dogbane

Apocynum pumilum and dogbane both are nouns.

Word	Noun	Adjective	Verb	Adverb
Apocynum pumilum	Yes	No	No	No
dogbane	Yes	No	No	No

As nouns, dogbane is a hypernym of Apocynum pumilum; that is, dogbane is a word with a broader meaning than Apocynum pumilum:

Apocynum pumilum: North American plant similar to common dogbane
dogbane: any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root

Apocynum pumilum (noun)	dogbane (noun)
North American plant similar to common dogbane	any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root