wayfaring tree vs shrub

wayfaring tree and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
wayfaring tree	Yes	No	No	No
shrub	Yes	No	No	No

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

wayfaring tree: 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 wayfaring tree include bush.

wayfaring tree (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