bear's-paw fern vs fern

bear's-paw fern and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
bear's-paw fern	Yes	No	No	No
fern	Yes	No	No	No

As nouns, fern is a hypernym of bear's-paw fern; that is, fern is a word with a broader meaning than bear's-paw fern:

bear's-paw fern: epiphytic fern with large fronds; Taiwan and Philippines
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

bear's-paw fern (noun)	fern (noun)
epiphytic fern with large fronds; Taiwan and Philippines	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores