Hibiscus sabdariffa vs hibiscus

Hibiscus sabdariffa and hibiscus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hibiscus sabdariffa	Yes	No	No	No
hibiscus	Yes	No	No	No

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

Hibiscus sabdariffa: East Indian sparsely prickly annual herb or perennial subshrub widely cultivated for its fleshy calyxes used in tarts and jelly and for its bast fiber
hibiscus: any plant of the genus Hibiscus

Hibiscus sabdariffa (noun)	hibiscus (noun)
East Indian sparsely prickly annual herb or perennial subshrub widely cultivated for its fleshy calyxes used in tarts and jelly and for its bast fiber	any plant of the genus Hibiscus