lesser vs slighter

lesser

noun
  • a thing that is of smaller size, value, importance etc. 

adj
  • Of two (or, rarely, more than two) things: the smaller in size (littler), in value, in importance etc. 

slighter

noun
  • One who slights. 

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