grunt vs hum

grunt

verb
  • To make a grunt or grunts. 

  • To break wind; to fart. 

noun
  • A short snorting sound, often to show disapproval, or used as a reply when one is reluctant to speak. 

  • An infantry soldier. 

  • A dessert of steamed berries and dough, usually blueberries; blueberry grunt. 

  • Any fish of the perciform family Haemulidae. 

  • A person who does ordinary and boring work. 

  • The amount of power of which a vehicle is capable. 

  • The snorting cry of a pig. 

hum

verb
  • To express by humming. 

  • To produce low sounds which blend continuously 

  • 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 grunt and hum occurred in a corpus of books? (source: Google Ngram Viewer )