friborg vs tithing

friborg

noun
  • The pledge and tithing, afterwards called by the Normans frankpledge 

tithing

noun
  • The tithe given as an offering to the church. 

  • The payment of tithes. 

  • A part of the hundred as a rural division of territory. 

  • The collection of tithes. 

  • Ten sheaves of wheat (originally set up as such for the tithe-proctor). 

  • A body of households (originally a tenth of a hundred or ten households) bound by frankpledge to collective responsibility and punishment for each other's behavior. 

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