Pteris cretica vs fern

Pteris cretica and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pteris cretica	Yes	No	No	No
fern	Yes	No	No	No

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

Pteris cretica: cultivated in many varieties as houseplants
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Pteris cretica (noun)	fern (noun)
cultivated in many varieties as houseplants	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores