fuller vs waulker

fuller

noun
  • A person who fulls cloth. 

  • A convex, rounded or grooved tool, used by blacksmiths for shaping metal. 

  • A groove made by such a tool (in the blade of a sword etc.). 

verb
  • To form a groove or channel in, by a fuller or set hammer. 

waulker

noun
  • Synonym of fuller. 

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