Hibiscus farragei vs shrub

Hibiscus farragei and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hibiscus farragei	Yes	No	No	No
shrub	Yes	No	No	No

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

Hibiscus farragei: southern and western Australian shrub with unlobed or shallowly lobed toothed leaves and purple flowers; sometimes placed in genus Hibiscus
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Hibiscus farragei include bush.

Hibiscus farragei (noun)	shrub (noun)
southern and western Australian shrub with unlobed or shallowly lobed toothed leaves and purple flowers; sometimes placed in genus Hibiscus	a low woody perennial plant usually having several major stems