enhancement vs speckle

enhancement

noun
  • An improvement or supplement that tends to increase a sense of esteem. 

  • The degree to which the image of a scan stands out as a bright area. 

speckle

verb
  • To mark with speckles. 

noun
  • A small spot or speck on the skin, plumage or foliage. 

  • Kind; sort. 

  • A cluster of interchromatin granules in a nucleus. 

  • The random distribution of light when it is scattered by a rough surface. 

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