compass plant vs subshrub

compass plant and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
compass plant	Yes	No	No	No
subshrub	Yes	No	No	No

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

Other hypernyms of compass plant include suffrutex.

compass plant (noun)	subshrub (noun)
any of several plants having leaves so arranged on the axis as to indicate the cardinal points of the compass	low-growing woody shrub or perennial with woody base
North American annual with red or rose-colored flowers