glazen vs perspicuous

glazen

adj
  • Resembling glass; glassy. 

  • Made or consisting of glass. 

perspicuous

adj
  • Transparent; translucent. 

  • (Of a language or notation) the process of inference from premises to conclusion is explicitly laid out. 

  • Clearly expressed, easy to understand; lucid. 

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