wormwood vs subshrub

wormwood and subshrub both are nouns.

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

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

wormwood: any of several low composite herbs of the genera Artemisia or Seriphidium
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of wormwood include suffrutex.

wormwood (noun)	subshrub (noun)
any of several low composite herbs of the genera Artemisia or Seriphidium	low-growing woody shrub or perennial with woody base