RichThesaurus
black as the ace of spades
vs
nigrescent
black as the ace of spades
adj
Utterly black; pitch-black.
nigrescent
adj
Approaching blackness; blackish, dark-coloured.
How often have the words
black as the ace of spades
and
nigrescent
occurred in a corpus of books?
(source:
Google Ngram Viewer
)