cupflower vs shrub

cupflower and shrub both are nouns.

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

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

cupflower: Mexican evergreen climbing plant having large solitary funnel-shaped fragrant yellow flowers with purple-brown ridges in the throat
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of cupflower include bush.

cupflower (noun)	shrub (noun)
any of various plants of the genus Nierembergia having upturned bell-shaped flowers	a low woody perennial plant usually having several major stems
Mexican evergreen climbing plant having large solitary funnel-shaped fragrant yellow flowers with purple-brown ridges in the throat