hieroglyphic vs idiom

hieroglyphic

noun
  • Undecipherable handwriting or secret symbol. 

  • Any symbol used in this system; a hieroglyph. 

  • A writing system of ancient Egypt, Minoans, Maya and other civilizations, using pictorial symbols to represent individual sounds as a rebus 

adj
  • difficult to decipher 

  • of, relating to, or written with this system of symbols 

idiom

noun
  • An established phrasal expression whose meaning may not be deducible from the literal meanings of its component words. 

  • An artistic style (for example, in art, architecture, or music); an instance of such a style. 

  • A manner of speaking, a mode of expression peculiar to a language, language family, or group of people. 

  • A programming construct or phraseology that is characteristic of the language. 

  • A language or language variety; specifically, a restricted dialect used in a given historical period, context etc. 

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