inference vs supposal

inference

noun
  • That which is inferred; a truth or proposition drawn from another which is admitted or supposed to be true; a conclusion; a deduction. 

  • The act or process of inferring by deduction or induction. 

supposal

noun
  • Something supposed; a supposition, a hypothesis. 

  • The act of supposing; supposition. 

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