butterfly flower vs shrub

butterfly flower and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
butterfly flower	Yes	No	No	No
shrub	Yes	No	No	No

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

butterfly flower: shrub or small tree of Dutch Guiana having clusters of pink flowers streaked with purple
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of butterfly flower include bush.

butterfly flower (noun)	shrub (noun)
any plant of the genus Schizanthus having finely divided leaves and showy variegated flowers	a low woody perennial plant usually having several major stems
shrub or small tree of Dutch Guiana having clusters of pink flowers streaked with purple