invalid vs lawful

invalid

verb
  • To make invalid or affect with disease. 

  • To exempt from (often military) duty because of injury or ill health. 

adj
  • Not valid; not true, correct, acceptable or appropriate. 

  • Suffering from disability or illness. 

  • Intended for use by an invalid. 

lawful

noun
  • A character having a lawful alignment. 

adj
  • Operating according to some law or fundamental principle. 

  • Conforming to, or recognised by the laws of society. 

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