poniard vs sgian dubh

poniard

noun
  • A dagger typically having a slender square or triangular blade. 

verb
  • To stab with a poniard. 

sgian dubh

noun
  • A small, single-edged knife worn tucked into the hose (stocking) as part of traditional Scottish Highland dress along with the kilt. 

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