ovum vs rudiment

ovum

noun
  • The female gamete in animals; the egg cell. 

rudiment

noun
  • A body part that no longer has a function 

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

  • A form that lacks full or complex development. 

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

verb
  • To ground; to settle in first principles. 

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