spikemoss vs lycopod

spikemoss and lycopod both are nouns.

Word	Noun	Adjective	Verb	Adverb
spikemoss	Yes	No	No	No
lycopod	Yes	No	No	No

As nouns, lycopod is a hypernym of spikemoss; that is, lycopod is a word with a broader meaning than spikemoss:

spikemoss: any of numerous fern allies of the genus Selaginella
lycopod: primitive evergreen moss-like plant with spores in club-shaped strobiles

Other hypernyms of spikemoss include club-moss, club moss.

spikemoss (noun)	lycopod (noun)
any of numerous fern allies of the genus Selaginella	primitive evergreen moss-like plant with spores in club-shaped strobiles