cushion flower vs shrub

cushion flower and shrub both are nouns.

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

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

cushion flower: tall straggling shrub with large globose crimson-yellow flowers; western Australia
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of cushion flower include bush.

cushion flower (noun)	shrub (noun)
tall straggling shrub with large globose crimson-yellow flowers; western Australia	a low woody perennial plant usually having several major stems