beleaguer vs irk

beleaguer

verb
  • To vex, harass, or beset. 

  • To besiege; to surround with troops. 

  • To exhaust. 

irk

verb
  • to irritate; annoy; bother 

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