Sphacele calycina vs shrub

Sphacele calycina and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sphacele calycina	Yes	No	No	No
shrub	Yes	No	No	No

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

Sphacele calycina: California plant with woolly stems and leaves and large white flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Sphacele calycina include bush.

Sphacele calycina (noun)	shrub (noun)
California plant with woolly stems and leaves and large white flowers	a low woody perennial plant usually having several major stems