Culcita dubia vs fern

Culcita dubia and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
Culcita dubia	Yes	No	No	No
fern	Yes	No	No	No

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

Culcita dubia: resembles Pteridium aquilinum; of Queensland, Australia
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Culcita dubia (noun)	fern (noun)
resembles Pteridium aquilinum; of Queensland, Australia	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores