crampbark vs shrub

crampbark and shrub both are nouns.

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

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

crampbark: deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of crampbark include bush.

crampbark (noun)	shrub (noun)
deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries	a low woody perennial plant usually having several major stems