sun rose vs shrub

sun rose and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
sun rose	Yes	No	No	No
shrub	Yes	No	No	No

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

sun rose: any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of sun rose include bush.

sun rose (noun)	shrub (noun)
any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions	a low woody perennial plant usually having several major stems