fern vs ferny

fern is a noun but ferny is not a noun.

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

fern (noun)	ferny (noun)
any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

fern (adjective)	ferny (adjective)
	abounding in or covered with ferns
	resembling ferns especially in leaf shape