ground pine vs club moss

ground pine and club moss both are nouns.

Word	Noun	Adjective	Verb	Adverb
ground pine	Yes	No	No	No
club moss	Yes	No	No	No

As nouns, club moss is a hypernym of ground pine; that is, club moss is a word with a broader meaning than ground pine:

ground pine: any of several club mosses having long creeping stems and erect branches
club moss: primitive evergreen moss-like plant with spores in club-shaped strobiles

Other hypernyms of ground pine include club-moss, lycopod.

ground pine (noun)	club moss (noun)
any of several club mosses having long creeping stems and erect branches	primitive evergreen moss-like plant with spores in club-shaped strobiles
low-growing annual with yellow flowers dotted red; faintly aromatic of pine resin; Europe, British Isles and North Africa