fleck vs stria

fleck

noun
  • A small spot or streak; a speckle. 

  • A lock, as of wool. 

  • A flake. 

  • A small amount. 

verb
  • To mark (something) with small spots. 

stria

noun
  • A stretch mark. 

  • A stripe, usually one of a set of parallel stripes. 

  • One of the fillets between the flutes of columns, etc.. 

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