hieroglyphic vs writing system

hieroglyphic

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

  • Undecipherable handwriting or secret symbol. 

  • Any symbol used in this system; a hieroglyph. 

adj
  • difficult to decipher 

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

writing system

noun
  • The basic type of a system for writing languages. For example, alphabetic writing or logographic writing. 

  • A system for writing one or more languages; a particular alphabetic, syllabic, logographic, or other scheme. For example, the Latin alphabet or the Cyrillic alphabet. 

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