roe vs rudiment

roe

noun
  • The sperm of certain fish. 

  • The eggs of fish. 

  • The ovaries of certain crustaceans. 

  • A mottled appearance of light and shade in wood, especially in mahogany. 

rudiment

verb
  • To ground; to settle in first principles. 

noun
  • A fundamental principle or skill, especially in a field of learning. 

  • A body part that no longer has a function 

  • A form that lacks full or complex development. 

  • In percussion, one of a selection of basic drum patterns learned as an exercise. 

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