foray vs shelter

foray

verb
  • To participate in a foray. 

  • To do or attempt something outside one's typical area of expertise. 

noun
  • A brief excursion or attempt, especially outside one's accustomed sphere. 

  • A sudden or irregular incursion in border warfare; hence, any irregular incursion for war or spoils; a raid. 

shelter

verb
  • To take cover. 

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

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 foray and shelter occurred in a corpus of books? (source: Google Ngram Viewer )