twistwood vs shrub

twistwood and shrub both are nouns.

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

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

twistwood: vigorous deciduous European treelike shrub common along waysides; red berries turn black
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of twistwood include bush.

twistwood (noun)	shrub (noun)
vigorous deciduous European treelike shrub common along waysides; red berries turn black	a low woody perennial plant usually having several major stems