motet vs recitative

motet

noun
  • A composition adapted to sacred words in the elaborate polyphonic church style; an anthem. 

recitative

noun
  • dialogue, in an opera etc, that, rather than being sung as an aria, is reproduced with the rhythms of normal speech, often with simple musical accompaniment or harpsichord continuo, serving to expound the plot 

adj
  • of a recital 

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