different between confirmatory vs corroborative

English

confirmatory (comparative more confirmatory, superlative most confirmatory)

Serving to confirm something.
- 1924, Herman Melville, Billy Budd, London: Constable & Co., Chapter 16, [2]
  "Do you come to me, Master-at-arms, with so foggy a tale? As to Budd, cite me an act or spoken word of his confirmatory of what you in general charge against him. […] "
- 1986, Mark S. Gold and A.L.C. Pottash, Diagnostic and Laboratory Testing in Psychiatry, New York and London: Plenum Medical Book Company, Chapter 3, p. 43, [3]
  The main indication for performing the DST is for the confirmation of suspected major depression. A positive test is excellent confirmatory evidence of the diagnosis.

corroborate +? -ive

corroborative (comparative more corroborative, superlative most corroborative)

corroborative (plural corroboratives)

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