smile vs watch

smile

verb
  • To be propitious or favourable; to countenance. 

  • To have (a smile) on one's face. 

  • To express by smiling. 

  • To express amusement, pleasure, or love and kindness. 

  • To look cheerful and joyous; to have an appearance suited to excite joy. 

noun
  • Favour; propitious regard. 

  • A facial expression comprised by flexing the muscles of both ends of one's mouth, often showing the front teeth, without vocalisation, and in humans is a common involuntary or voluntary expression of happiness, pleasure, amusement, goodwill, or anxiety. 

watch

verb
  • To be wary or cautious of. 

  • To mind, attend, or guard. 

  • To serve the purpose of a watchman by floating properly in its place. 

  • To be vigilant or on one's guard. 

  • To look at, see, or view for a period of time. 

  • To remain awake with a sick or dying person; to maintain a vigil. 

  • To observe over a period of time; to notice or pay attention. 

  • To act as a lookout. 

  • To attend to dangers to or regarding. 

noun
  • A portable or wearable timepiece. 

  • The act of guarding and observing someone or something. 

  • A period of wakefulness between the two sleeps of a biphasic sleep pattern (the dead sleep or first sleep and morning sleep or second sleep): the first waking. 

  • The post or office of a watchman; also, the place where a watchman is posted, or where a guard is kept. 

  • A particular time period when guarding is kept. 

  • A person or group of people who guard. 

  • A period of time on duty, usually four hours in length; the officers and crew who tend the working of a vessel during the same watch. (FM 55–501). 

  • The act of seeing, or viewing, for a period of time. 

  • A group of sailors and officers aboard a ship or shore station with a common period of duty: starboard watch, port watch. 

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