inky cap vs Coprinus atramentarius

inky cap and Coprinus atramentarius both are nouns.

Word	Noun	Adjective	Verb	Adverb
inky cap	Yes	No	No	No
Coprinus atramentarius	Yes	No	No	No

As nouns, inky cap and Coprinus atramentarius are synonyms defined as:

inky cap and Coprinus atramentarius: having a cap that melts into an inky fluid after spores have matured

Other synonyms of inky cap include inky-cap mushroom.

inky cap (noun)	Coprinus atramentarius (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