glebe vs tillage

glebe

noun
  • Turf; soil; ground; sod. 

  • In medieval Europe, an area of land, belonging to a parish, whose revenues contributed towards the parish expenses. 

  • A field or meadow. 

  • A piece of earth containing ore. 

tillage

noun
  • Land cultivated in this way. 

  • The cultivation of arable land by plowing, sowing and raising crops. 

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