Athyrium thelypteroides vs fern

Athyrium thelypteroides and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
Athyrium thelypteroides	Yes	No	No	No
fern	Yes	No	No	No

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

Athyrium thelypteroides: fern with elongate silvery outgrowths enclosing the developing spores
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Athyrium thelypteroides (noun)	fern (noun)
fern with elongate silvery outgrowths enclosing the developing spores	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores