Pteridium esculentum vs fern

Pteridium esculentum and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pteridium esculentum	Yes	No	No	No
fern	Yes	No	No	No

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

Pteridium esculentum: fern of southeastern Asia; not hardy in cold temperate regions
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Pteridium esculentum (noun)	fern (noun)
fern of southeastern Asia; not hardy in cold temperate regions	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores