rumormonger vs tell tales out of school

rumormonger

verb

  • To spread rumors and gossip. 

noun

  • A person who spreads rumors and gossip. 

tell tales out of school

verb

  • To reveal confidential or sensitive information; to gossip. 

How often have the words rumormonger and tell tales out of school occurred in a corpus of books? (source: Google Ngram Viewer )