Tweeter vs tweep

Tweeter

tweep

verb

  • To chirp or beep. 

  • To kill; to assassinate. 

noun

  • A Twitter employee. 

  • A user of the Twitter microblogging service. 

  • A chirp or beep. 

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