boff vs shelter

boff

verb
  • To hit; to strike. 

  • to have sexual intercourse (with someone) 

noun
  • A great success; a hit. 

  • A pupil who works hard; a swot. 

  • A line in a film etc that elicits such a laugh. 

  • A big laugh. 

  • A hit or smack. 

shelter

verb
  • To provide cover from damage or harassment; to shield; to protect. 

  • To take cover. 

noun
  • A refuge, haven or other cover or protection from something. 

  • An institution that provides temporary housing for homeless people, battered women, etc. 

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