chaffweed vs subshrub

chaffweed and subshrub both are nouns.

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

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

Other hypernyms of chaffweed include suffrutex.

chaffweed (noun)	subshrub (noun)
weedy plant having short dry chafflike leaves	low-growing woody shrub or perennial with woody base