blab vs rumour

blab

noun
  • Gossip; prattle. 

  • One who blabs; a babbler; a telltale; a gossip or gossiper. 

verb
  • to speak carelessly or excessively 

  • To tell tales; to gossip without reserve or discretion. 

rumour

noun
  • Britain, Canada, New Zealand, Australia, and Ireland spelling of rumor 

verb
  • Commonwealth standard spelling of rumor. 

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