buddleia vs shrub

buddleia and shrub both are nouns.

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

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

buddleia: tropical shrub having clusters of white or violet or yellow flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of buddleia include bush.

buddleia (noun)	shrub (noun)
tropical shrub having clusters of white or violet or yellow flowers	a low woody perennial plant usually having several major stems