Hibiscus mutabilis vs hibiscus

Hibiscus mutabilis and hibiscus both are nouns.

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

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

Hibiscus mutabilis: Chinese shrub or small tree having white or pink flowers becoming deep red at night; widely cultivated; naturalized in southeastern United States
hibiscus: any plant of the genus Hibiscus

Hibiscus mutabilis (noun)	hibiscus (noun)
Chinese shrub or small tree having white or pink flowers becoming deep red at night; widely cultivated; naturalized in southeastern United States	any plant of the genus Hibiscus