evidential vs probative

evidential

adj
  • Of or providing evidence. 

noun
  • A syntactic element (affix, clitic, or particle) that indicates evidentiality. 

probative

adj
  • Tending to prove a particular proposition or to persuade someone of the truth of an allegation. 

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