marmalade bush vs shrub

marmalade bush and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
marmalade bush	Yes	No	No	No
shrub	Yes	No	No	No

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

marmalade bush: evergreen South American shrub having showy trumpet-shaped orange flowers; grown as an ornamental or houseplant
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of marmalade bush include bush.

marmalade bush (noun)	shrub (noun)
evergreen South American shrub having showy trumpet-shaped orange flowers; grown as an ornamental or houseplant	a low woody perennial plant usually having several major stems