cat's-foot vs ground-ivy

cat's-foot

noun
  • Synonym of ground ivy (Glechoma hederacea). 

  • Synonym of mountain cudweed (Antennaria dioica). 

  • Synonym of cat's-paw: a foot of a cat; (figurative, obsolete) a person used unwittingly or through trickery by another. 

ground-ivy

noun
  • Glechoma hederacea, an aromatic, perennial, evergreen creeper of the mint family Lamiaceae 

How often have the words cat's-foot and ground-ivy occurred in a corpus of books? (source: Google Ngram Viewer )