candlewood vs shrub

candlewood and shrub both are nouns.

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

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

Other hypernyms of candlewood include bush.

candlewood (noun)	shrub (noun)
any of several resinous trees or shrubs often burned for light	a low woody perennial plant usually having several major stems