increscent vs summative

increscent

noun
  • A crescent oriented with horns turned to dexter (pointing left). 

adj
  • Of the Moon: growing in apparent size; waxing. 

summative

adj
  • Denoting forms of assessment used to quantify educational outcomes. 

  • Of, pertaining to, or produced by summation. 

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