African-American vs black as the ace of spades

African-American

adj

Of Black African descent.
Of or pertaining to the culture of African-American people.
An American who is of Sub-Saharan African ancestry.
American and black.

noun

A black American.
Any black person.

black as the ace of spades

adj

Utterly black; pitch-black.

How often have the words African-American and black as the ace of spades occurred in a corpus of books? (source: Google Ngram Viewer )