white cinnamon tree vs shrub

white cinnamon tree and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
white cinnamon tree	Yes	No	No	No
shrub	Yes	No	No	No

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

white cinnamon tree: large evergreen shrub or small tree having white aromatic bark and leathery leaves and small purple to red flowers in terminal cymes
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of white cinnamon tree include bush.

white cinnamon tree (noun)	shrub (noun)
large evergreen shrub or small tree having white aromatic bark and leathery leaves and small purple to red flowers in terminal cymes	a low woody perennial plant usually having several major stems