woodruff vs subshrub

woodruff and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
woodruff	Yes	No	No	No
subshrub	Yes	No	No	No

As nouns, subshrub is a hypernym of woodruff; that is, subshrub is a word with a broader meaning than woodruff:

Other hypernyms of woodruff include suffrutex.

woodruff (noun)	subshrub (noun)
any plant of the genus Asperula	low-growing woody shrub or perennial with woody base
Old World fragrant stoloniferous perennial having small white flowers and narrow leaves used as flavoring and in sachets; widely cultivated as a ground cover; in some classifications placed in genus Asperula