discoid vs looped

discoid

adj
  • Shaped like a disc/disk. 

noun
  • A disk-shaped dental excavator designed to remove the carious dentin of a decayed tooth 

looped

adj
  • whorled 

  • having loops 

  • formed into a loop 

  • drunk 

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