foray vs onset

foray

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. 

verb
  • To participate in a foray. 

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

onset

noun
  • A setting about; a beginning. 

  • The initial portion of a syllable, preceding the syllable nucleus. 

  • The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak. 

  • The initial phase of a disease or condition, in which symptoms first become apparent. 

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