hay-scented fern vs boulder fern

hay-scented fern and boulder fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
hay-scented fern	Yes	No	No	No
boulder fern	Yes	No	No	No

As nouns, hay-scented fern and boulder fern are synonyms defined as:

hay-scented fern and boulder fern: fern of eastern North America with pale green fronds and an aroma like hay

Other synonyms of hay-scented fern include Dennstaedtia punctilobula, hay-scented, scented fern.

hay-scented fern (noun)	boulder fern (noun)
fern of eastern North America with pale green fronds and an aroma like hay	fern of eastern North America with pale green fronds and an aroma like hay