omen vs taster

omen

verb
  • To divine or predict from omens. 

  • To be an omen of. 

noun
  • A thing of prophetic significance. 

  • Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury. 

taster

noun
  • A person who is, by genetic makeup, able to taste phenylthiocarbamide 

  • A sample of something bigger or grander intended for future use 

  • Someone who tastes something, especially food, wine etc., for quality. 

  • A kind of zooid situated on the polyp-stem of certain Siphonophorae, resembling the feeding zooids, but destitute of mouths. 

  • An object in which, or by which, food or drink is tasted, for example a dram cup 

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