blowoff vs end piece

blowoff

noun
  • The explosive separation of part of a rocket etc in order to prevent its destruction and allow for retrieval 

  • Something that is blown off. 

  • A fart. 

  • An outburst of temper or excitement. 

  • A blowing off of steam, water, etc. 

end piece

noun
  • Any structure at the end of another. 

  • The axoneme on the flagella of a spermatozoon. 

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