slate vs tessellate

slate

verb
  • To cover with slate. 

  • To schedule. 

  • To criticise harshly. 

  • To set a dog upon (a person). 

  • To anticipate or strongly expect. 

  • To nominate, appoint, or designate. 

adj
  • Having the bluish-grey/gray colour of slate. 

noun
  • An artificial material resembling slate and used for the same purposes. 

  • A list of affiliated candidates for an election. 

  • A record of money owed. 

  • A tablet computer. 

  • A thin plate of any material; a flake. 

  • A fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed so that it cleaves easily into thin layers. 

  • The bluish-grey colour of most slate. 

  • A chalkboard, sheet of slate for writing on with chalk or with a thin rod of slate (a slate pencil) formerly commonly used by both students and teachers in schools. 

  • A roofing-tile made of slate. 

tessellate

verb
  • To cover with tiles or stones, as a mosaic; to tile. 

  • To completely fill (an area) when multiple copies of one or more two-dimensional shapes are placed edge to edge. 

  • Of a two-dimensional shape, such that multiple copies of itself placed edge to edge cover an area leaving no space between the shapes. 

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