bryanthus vs shrub

bryanthus and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
bryanthus	Yes	No	No	No
shrub	Yes	No	No	No

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

bryanthus: procumbent Old World mat-forming evergreen shrub with racemes of pinkish-white flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of bryanthus include bush.

bryanthus (noun)	shrub (noun)
procumbent Old World mat-forming evergreen shrub with racemes of pinkish-white flowers	a low woody perennial plant usually having several major stems