blemish vs weakness

blemish

noun
  • A moral defect; a character flaw. 

  • A small flaw which spoils the appearance of something, a stain, a spot. 

verb
  • To tarnish (reputation, character, etc.); to defame. 

  • To spoil the appearance of. 

weakness

noun
  • An inadequate quality; fault 

  • The condition of being weak. 

  • A special fondness or desire. 

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