convocation vs puddling

convocation

noun
  • A flock of eagles. 

  • An assembly or meeting. 

  • The act of calling or assembling by summons. 

  • An assembly of the clergy, by their representatives, to consult on ecclesiastical affairs. 

  • An academic assembly, in which the business of a university is transacted. 

puddling

noun
  • A group of mallards (ducks). 

  • The act of lining a canal with puddle to make it watertight. 

  • The action of forming a puddle. 

  • The first true industrial process to produce steel from pig iron. 

  • A behaviour in which animals like butterflies seek out moist substances to obtain nutrients. 

  • The process of working clay, loam, pulverized ore, etc., with water, to render it compact, or impervious to liquids. 

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