fern ally vs lycopod

fern ally and lycopod both are nouns.

Word	Noun	Adjective	Verb	Adverb
fern ally	Yes	No	No	No
lycopod	Yes	No	No	No

As nouns, lycopod is a hyponym of fern ally; that is, lycopod is a word with a more specific, narrower meaning than fern ally:

fern ally: pteridophytes of other classes than Filicopsida
lycopod: primitive evergreen moss-like plant with spores in club-shaped strobiles

Other hyponyms of fern ally include whisk fern, horsetail, club-moss, club moss, quillwort.

fern ally (noun)	lycopod (noun)
pteridophytes of other classes than Filicopsida	primitive evergreen moss-like plant with spores in club-shaped strobiles