imprecation vs malediction

imprecation

noun

  • A curse. 

  • The act of imprecating, or invoking evil upon someone; a prayer that a curse or calamity may befall someone. 

malediction

noun

  • A curse. 

  • Evil speech. 

How often have the words imprecation and malediction occurred in a corpus of books? (source: Google Ngram Viewer )