travelling vs tripper

travelling

noun
  • The act of one who travels; a journey. 

adj
  • That travels (with one) 

tripper

noun
  • One who trips or stumbles. 

  • A person experiencing a hallucinogenic trip. 

  • A tourist. 

  • Synonym of tripman 

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