Jersey fern vs fern

Jersey fern and fern both are nouns.

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

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

Jersey fern: small short-lived fern of Central and South America
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Jersey fern (noun)	fern (noun)
small short-lived fern of Central and South America	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores