Mohria caffrorum vs fern

Mohria caffrorum and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mohria caffrorum	Yes	No	No	No
fern	Yes	No	No	No

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

Mohria caffrorum: sweetly scented African fern with narrow bipinnate fronds
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

Mohria caffrorum (noun)	fern (noun)
sweetly scented African fern with narrow bipinnate fronds	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores