pachysandra vs subshrub

pachysandra and subshrub both are nouns.

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

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

pachysandra: any plant of the genus Pachysandra; low-growing evergreen herbs or subshrubs having dentate leaves and used as ground cover
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of pachysandra include suffrutex.

pachysandra (noun)	subshrub (noun)
any plant of the genus Pachysandra; low-growing evergreen herbs or subshrubs having dentate leaves and used as ground cover	low-growing woody shrub or perennial with woody base