conglutinate vs piecen

conglutinate

verb
  • To join together; to unite. 

  • To stick or glue together. 

adj
  • Glued together; united, as by some adhesive substance. 

piecen

verb
  • To join; piece (together); fay. 

  • To extend by adding a part or parts. 

  • To join broken threads or ends in spinning. 

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