class Filicopsida vs fern

class Filicopsida and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Filicopsida	Yes	No	No	No
fern	Yes	No	No	No

class Filicopsida (noun)	fern (noun)
ferns	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores