lindworm vs wyrm

lindworm

noun
  • A wingless serpentine dragon having two arms. 

  • A draconic creature, similar to a wyvern. 

wyrm

noun
  • A huge limbless and wingless dragon or dragon-like creature. 

  • A sea serpent. 

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