banksia vs shrub

banksia and shrub both are nouns.

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

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

banksia: any shrub or tree of the genus Banksia having alternate leathery leaves apetalous yellow flowers often in showy heads and conelike fruit with winged seeds
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of banksia include bush.

banksia (noun)	shrub (noun)
any shrub or tree of the genus Banksia having alternate leathery leaves apetalous yellow flowers often in showy heads and conelike fruit with winged seeds	a low woody perennial plant usually having several major stems