chug vs hum

chug

verb
  • To make dull explosive sounds. 

  • To drink a large amount (especially of beer) in a single action/without breathing; to chugalug. Usually chanted at the person who is drinking. 

  • To solicit charitable donations on the street, particularly in a persistent manner. 

  • To move or travel at a steady, although not especially fast, pace. 

  • To move or travel whilst making such sounds. 

noun
  • A large gulp of drink. 

  • A dull, fairly quick explosive or percussive sound, as if made by a labouring engine. 

  • A person of Native American descent. 

  • A homemade Cuban boat, built to carry emigrants to the USA, and often abandoned upon arrival. 

  • A dog that is a cross between a pug and a chihuahua. 

hum

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. 

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. 

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