golden fern vs fern

golden fern and fern both are nouns.

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

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

golden fern: stout tropical swamp fern (especially tropical America) having large fronds with golden yellow sporangia covering the undersides
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

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

golden fern: tropical American fern having fronds with light golden undersides
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

golden fern (noun)	fern (noun)
stout tropical swamp fern (especially tropical America) having large fronds with golden yellow sporangia covering the undersides	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
tropical American fern having fronds with light golden undersides