Hernaria glabra vs groundcover

Hernaria glabra and groundcover both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hernaria glabra	Yes	No	No	No
groundcover	Yes	No	No	No

As nouns, groundcover is a hypernym of Hernaria glabra; that is, groundcover is a word with a broader meaning than Hernaria glabra:

Hernaria glabra: common prostrate Old World herb often used as a ground cover; formerly reputed to cure ruptures
groundcover: low-growing plants planted in deep shade or on a steep slope where turf is difficult to grow

Other hypernyms of Hernaria glabra include ground cover.

Hernaria glabra (noun)	groundcover (noun)
common prostrate Old World herb often used as a ground cover; formerly reputed to cure ruptures	small plants other than saplings growing on a forest floor
	low-growing plants planted in deep shade or on a steep slope where turf is difficult to grow