corkwood vs shrub

corkwood and shrub both are nouns.

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

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

corkwood: very small deciduous dioecious tree or shrub of damp habitats in southeastern United States having extremely light wood
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of corkwood include bush.

corkwood (noun)	shrub (noun)
very small deciduous dioecious tree or shrub of damp habitats in southeastern United States having extremely light wood	a low woody perennial plant usually having several major stems