Traveller vs pavee

Traveller

noun
  • Irish English standard spelling of Irish Traveller.; A member of a nomadic ethnic minority in Ireland. 

  • a member of a nomadic ethnic minority in Norway 

pavee

noun
  • A traveller, a member of Ireland's nomadic ethnic minority. 

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