bubblegum vs roof of the mouth

bubblegum

noun
  • A sweet chewing gum formulated to be stretchy so the chewer can blow bubbles with it. 

  • A type of pop music marked by sweetness, pep and charm (rather than depth or complexity). 

  • A light pink colour, like bubblegum. 

adj
  • Sweet, perky, or youthful. 

  • Tasting like bubblegum. 

roof of the mouth

noun
  • The upper internal surface of the mouth that separates the oral and nasal cavities, found in people and some mammals. 

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