RichThesaurus
black as the ace of spades
vs
black as thunder
black as the ace of spades
adj
Utterly black; pitch-black.
black as thunder
adj
Very black (especially of a mood, a frown, etc.).
How often have the words
black as the ace of spades
and
black as thunder
occurred in a corpus of books?
(source:
Google Ngram Viewer
)