scented fern vs fern

scented fern and fern both are nouns.

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

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

scented fern: fern of eastern North America with pale green fronds and an aroma like hay
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 scented fern; that is, fern is a word with a broader meaning than scented fern:

scented fern: 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

scented fern (noun)	fern (noun)
fern of eastern North America with pale green fronds and an aroma like hay	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
common perennial aromatic herb native to Eurasia having buttonlike yellow flower heads and bitter-tasting pinnate leaves sometimes used medicinally
sweetly scented African fern with narrow bipinnate fronds