pasture brake vs fern

pasture brake and fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
pasture brake	Yes	No	No	No
fern	Yes	No	No	No

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

pasture brake: large coarse fern often several feet high; essentially weed ferns; cosmopolitan
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

pasture brake (noun)	fern (noun)
large coarse fern often several feet high; essentially weed ferns; cosmopolitan	any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores