hum vs sing

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. 

sing

verb
  • To make a small, shrill sound. 

  • To display fine qualities; to stand out as excellent. 

  • To be capable of being sung; to produce a certain effect by being sung. 

  • To soothe with singing. 

  • To confess under interrogation. 

  • In traditional Aboriginal culture, to direct a supernatural influence on (a person or thing), usually malign; to curse. 

  • To produce a 'song', for the purposes of defending a breeding territory or to attract a mate. 

  • To produce any type of melodious vocalisation. 

  • To produce musical or harmonious sounds with one’s voice. 

  • To express audibly by means of a harmonious vocalization. 

  • To perform a vocal part in a musical composition, regardless of technique. 

  • To relate in verse; to celebrate in poetry. 

noun
  • The act, or event, of singing songs. 

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