Indian hemp vs hibiscus

Indian hemp and hibiscus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Indian hemp	Yes	No	No	No
hibiscus	Yes	No	No	No

As nouns, hibiscus is a hypernym of Indian hemp; that is, hibiscus is a word with a broader meaning than Indian hemp:

Indian hemp: valuable fiber plant of East Indies now widespread in cultivation
hibiscus: any plant of the genus Hibiscus

Indian hemp (noun)	hibiscus (noun)
Canadian dogbane yielding a tough fiber used as cordage by Native Americans; used in folk medicine for pain or inflammation in joints	any plant of the genus Hibiscus
source of e.g. bhang and hashish as well as fiber
valuable fiber plant of East Indies now widespread in cultivation