allusion vs antistrophe

allusion

noun
  • An indirect reference; a hint; a reference to something supposed to be known, but not explicitly mentioned 

antistrophe

noun
  • The retort or turning of an adversary's plea against him. 

  • The lines of this part of the choral song. 

  • The repetition of a word or phrase at the end of successive clauses 

  • In Greek choruses and dances, the returning of the chorus, exactly answering to a previous strophe or movement from right to left. 

  • The repetition of words in an inverse order. 

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