inky-cap mushroom vs inky cap

inky-cap mushroom and inky cap both are nouns.

Word	Noun	Adjective	Verb	Adverb
inky-cap mushroom	Yes	No	No	No
inky cap	Yes	No	No	No

As nouns, inky-cap mushroom and inky cap are synonyms defined as:

inky-cap mushroom and inky cap: having a cap that melts into an inky fluid after spores have matured

Other synonyms of inky-cap mushroom include Coprinus atramentarius.

inky-cap mushroom (noun)	inky cap (noun)
having a cap that melts into an inky fluid after spores have matured	having a cap that melts into an inky fluid after spores have matured