attestation vs deponent

attestation

noun
  • A thing that serves to bear witness, confirm, or authenticate; validation, verification, documentation. 

  • The process, performed by accountants or auditors, of providing independent opinion on published financial and other business information of a business, public agency, or other organization. 

  • A confirmation or authentication. 

  • An appearance in print or otherwise recorded on a permanent medium. 

deponent

noun
  • A witness; especially one who gives information under oath, in a deposition concerning facts known to him or her. 

  • A deponent verb. 

adj
  • Having passive grammatical form (that is, conjugating like the passive voice), but an active meaning. 

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