quisquis vs which

quisquis

pron
  • Whoever, whosoever. 

adj
  • Synonym of quisquous. 

which

pron
  • The/Any ones that; whichever. 

  • What one or ones (of those mentioned or implied). 

  • Introduces a relative clause giving further information about something previously mentioned. 

det
  • What, of those mentioned or implied. 

  • The/Any ... that; whichever. 

  • Designates the one(s) previously mentioned. 

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