trio vs triplet

trio

noun
  • A group of three people or things. 

  • A piece of music written for three musicians. 

  • A group of three musicians. 

  • Any cocktail made with a spirit, a liqueur, and a creamy ingredient. 

  • A passage in the middle of a minuet, frequently in a different key. 

triplet

noun
  • One of a group of three, particularly 

  • A group of three notes played or written where two notes would ordinarily be; a form of tuplet. 

  • One of a group of three siblings born at the same time to the same mother. 

  • A constructed gem consisting of a thin slice of natural opal sandwiched between a clear glass or quartz top and a synthetic or stone backing that enhances the colour of the opal. 

  • A quantum state with three allowed projections for the spin. 

  • A triquark. 

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