jowl vs labium

jowl

noun
  • the cheek; especially the cheek meat of a hog. 

  • cut of fish including the head and adjacent parts 

  • the jaw, jawbone; especially one of the lateral parts of the mandible. 

  • a fold of fatty flesh under the chin, around the cheeks, or lower jaw (as a dewlap, wattle, crop, or double chin). 

labium

noun
  • The lip of a labiate corolla. 

  • A liplike structure; especially one of the two pairs of folds of skin on either side of the vulva. 

  • A liplike part of various invertebrates. 

  • The lip against which pressured air is driven to produce sound in a recorder and in a pipe organ with flue pipes. 

  • A lower mouthpart of an insect that is formed by the second pair of maxillae united in the middle line. 

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