devil's weed vs subshrub

devil's weed and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
devil's weed	Yes	No	No	No
subshrub	Yes	No	No	No

As nouns, subshrub is a hypernym of devil's weed; that is, subshrub is a word with a broader meaning than devil's weed:

devil's weed: tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of devil's weed include suffrutex.

devil's weed (noun)	subshrub (noun)
tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed	low-growing woody shrub or perennial with woody base