roe vs spermatozoan

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. 

spermatozoan

noun
  • A spermatozoon. 

adj
  • Of or pertaining to spermatozoa. 

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