taster vs tester

taster

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

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

  • 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 

tester

noun
  • A miniature pot of paint for testing and comparison purposes. 

  • A cyclist who focuses on success in time trials. 

  • A device used for testing. 

  • A canopy over a bed. 

  • A person who administers a test. 

  • A sample of perfume available in a shop for customers to try before they buy. 

  • An old French silver coin. 

  • Something that overhangs something else; especially a canopy or soundboard over a pulpit. 

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