boggy vs syrtic

boggy

adj
  • Having the qualities of a bog; i.e. dank, squishy, muddy, and full of water and rotting vegetation. 

syrtic

adj
  • Of or relating to a syrt; boggy; resembling quicksand. 

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