club moss vs club-moss

club moss and club-moss both are nouns.

Word	Noun	Adjective	Verb	Adverb
club moss	Yes	No	No	No
club-moss	Yes	No	No	No

As nouns, club moss and club-moss are synonyms defined as:

club moss and club-moss: primitive evergreen moss-like plant with spores in club-shaped strobiles

Other synonyms of club moss include lycopod.

club moss (noun)	club-moss (noun)
primitive evergreen moss-like plant with spores in club-shaped strobiles	primitive evergreen moss-like plant with spores in club-shaped strobiles