Cheilanthes gracillima vs fern

Cheilanthes gracillima and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cheilanthes gracillima	Yes	No	No	No
fern	Yes	No	No	No

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

Cheilanthes gracillima: small tufted fern of northwestern America
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Cheilanthes gracillima (noun)	fern (noun)
small tufted fern of northwestern America	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores