enunciation vs onomastics

enunciation

noun
  • The act of enunciating, announcing, proclaiming, or making known; open attestation; declaration. 

  • That which is enunciated or announced; words in which a proposition is expressed; formal declaration 

  • Mode of utterance or pronunciation, especially as regards fullness and distinctness or articulation. 

onomastics

noun
  • The branch of lexicology devoted to the study of names and naming, especially the origins of names. 

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