tattoo vs yolk

tattoo

noun
  • An image made in the skin with ink and a needle. 

  • A signal by drum or bugle ordering soldiers to return to their quarters. 

  • A military display or pageant. 

  • A pony of a certain breed from India. 

  • A method of decorating the skin by inserting colored substances under the surface with a sharp instrument (usually a solenoid-driven needle). 

  • A signal played five minutes before taps (lights out). 

verb
  • To hit the ball hard, as if to figuratively leave a tattoo on the ball. 

  • To tap rhythmically on, to drum. 

  • To apply a tattoo to (someone or something). 

yolk

noun
  • The grease in a sheep's fleece; lanolin. 

  • The yellow, spherical part of an egg that is surrounded by the white albumen, and serves as nutriment for the growing young. 

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