ongoing vs perfecting

ongoing

noun
  • Something that is going on; a happening. 

adj
  • Continuing, permanent, lasting. 

  • Presently or currently happening; being in progress. 

perfecting

noun
  • The process of printing on both sides of the printed-on material during its single pass through the printing press. 

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