woodsia vs fern

woodsia and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
woodsia	Yes	No	No	No
fern	Yes	No	No	No

As nouns, fern is a hypernym of woodsia; that is, fern is a word with a broader meaning than woodsia:

woodsia: any fern of the genus Woodsia
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

woodsia (noun)	fern (noun)
any fern of the genus Woodsia	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores