keeping vs portage

keeping

noun
  • Maintenance; support; provision; feed. 

  • conformity or harmony. 

  • charge or care. 

portage

verb
  • To carry a boat overland 

noun
  • An act of carrying, especially the carrying of a boat overland between two waterways. 

  • The route used for such carrying. 

  • The wages paid to a sailor when in port, or for a voyage. 

  • A charge made for carrying something. 

  • Carrying capacity; tonnage. 

  • A porthole. 

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