hum vs pong

hum

noun
  • Unpleasant odour. 

  • A phenomenon, or collection of phenomena, involving widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people. 

  • Busy activity, like the buzz of a beehive. 

  • A hummed tune, i.e. created orally with lips closed. 

  • An often indistinct sound resembling human humming. 

verb
  • To produce low sounds which blend continuously 

  • To express by humming. 

  • To reek, smell bad. 

  • To make a sound from the vocal chords without pronouncing any real words, with one's lips closed. 

  • To drone like certain insects naturally do in motion, or sounding similarly 

  • To buzz, be busily active like a beehive 

intj
  • Synonym of um: a noise indicating doubt, uncertainty, &c. 

  • Synonym of hmm: a noise indicating thought, consideration, &c. 

pong

noun
  • A stench, a bad smell. 

  • A packet sent in reply to a ping, thereby indicating the presence of a host. 

verb
  • To stink, to smell bad. 

  • To invent a line of dialogue when one has forgotten the actual line. 

  • To deliver a line of a play in an arch, suggestive or unnatural way, so as to draw undue attention to it. 

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