ephedra vs mahuang

ephedra and mahuang both are nouns.

Word	Noun	Adjective	Verb	Adverb
ephedra	Yes	No	No	No
mahuang	Yes	No	No	No

As nouns, mahuang is a hyponym of ephedra; that is, mahuang is a word with a more specific, narrower meaning than ephedra:

ephedra: jointed and nearly leafless desert shrub having reduced scalelike leaves and reddish fleshy seeds
mahuang: Chinese ephedra yielding ephedrine

Other hyponyms of ephedra include Ephedra sinica.

ephedra (noun)	mahuang (noun)
jointed and nearly leafless desert shrub having reduced scalelike leaves and reddish fleshy seeds	Chinese ephedra yielding ephedrine