pyxie vs shrub

pyxie and shrub both are nouns.

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

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

pyxie: creeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowers; of the pine barrens of New Jersey and the Carolinas
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of pyxie include bush.

pyxie (noun)	shrub (noun)
creeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowers; of the pine barrens of New Jersey and the Carolinas	a low woody perennial plant usually having several major stems