found vs invisible

found

verb
  • To form by melting a metal and pouring it into a mould; to cast. 

  • To melt, especially of metal in an industrial setting. 

  • To begin building. 

  • To start (an institution or organization). 

noun
  • A thin, single-cut file for comb-makers. 

invisible

adj
  • Not appearing on the surface. 

  • Apparently, but not actually, offline. 

  • Unable to be seen; out of sight; not visible. 

  • That is ignored by a person. 

verb
  • To make invisible, to invisiblize. 

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