RichThesaurus
black as the ace of spades
vs
murksome
black as the ace of spades
adj
Utterly black; pitch-black.
murksome
adj
Suggestive or indicative of murk; darksome.
How often have the words
black as the ace of spades
and
murksome
occurred in a corpus of books?
(source:
Google Ngram Viewer
)