Lycopodium selago vs club moss

Lycopodium selago and club moss both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lycopodium selago	Yes	No	No	No
club moss	Yes	No	No	No

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

Lycopodium selago: of northern Europe and America; resembling a miniature fir
club moss: primitive evergreen moss-like plant with spores in club-shaped strobiles

Other hypernyms of Lycopodium selago include club-moss, lycopod.

Lycopodium selago (noun)	club moss (noun)
of northern Europe and America; resembling a miniature fir	primitive evergreen moss-like plant with spores in club-shaped strobiles