eardrum vs owl

eardrum

noun
  • A thin membrane that separates the outer ear from the middle ear and transmits sound from the air to the malleus. 

owl

noun
  • Any of various birds of prey of the order Strigiformes that are primarily nocturnal and have forward-looking, binocular vision, limited eye movement, and good hearing. 

  • A person seen as having owl-like characteristics, especially appearing wise or serious, or being nocturnally active. 

  • Any of various nymphalid butterflies, especially in the genus Caligo, having large eyespots on the wings. 

  • An owl pigeon. 

  • A politician with moderate views that are neither hawkish nor dovish. 

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