papilla vs teat

papilla

noun
  • Any of the small protuberances on the upper surface of the tongue often containing taste buds. 

  • A vascular process of connective tissue extending into and nourishing the root of a hair, feather, or developing tooth. 

  • A small fleshy projection on a plant. 

  • Any of the vascular protuberances of the dermal layer of the skin extending into the epidermal layer and often containing tactile corpuscles. 

teat

noun
  • Something resembling a teat, such as a small protuberance or nozzle. 

  • The projection of a mammary gland from which, on female mammals, milk is secreted. 

  • Synonyms: tit (now vulgar), pap, nipple, dug 

  • An artificial nipple used for bottle-feeding infants. 

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