anaconda vs purple helmet

anaconda

noun

  • A large penis. 

  • The green anaconda; Eunectes murinus. 

  • Any of various large nonvenomous snakes of the genus Eunectes, found mainly in northern South America. 

name

  • A particular variety of stud poker. 

purple helmet

noun

  • The glans penis. 

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