twist wood vs shrub

twist wood and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
twist wood	Yes	No	No	No
shrub	Yes	No	No	No

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

twist wood: 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 twist wood include bush.

twist wood (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